German 6×30 Silvamar military service binoculars, production serial number, 22145, heavy construction, made of brass, black “Vulkanite” schwarzes Kunstleder (black synthetic leather) Körperbedeckung (body covering), brass fittings, with large (military) bridge locking nut, but without (military) Strichplatte (graduated range finding scale) in right lens, manufactured about December 1899 by Carl Zeiss, Jena, Thuringia.

Left prism cover marked in white with “CARL ZEISS” / “JENA” trademark logo.

Right prism cover marked in white with “SILVAMAR” / “22145” (production serial number) logo over “6 X”.

This Carl Zeiss Silvamar, serial number, 22145, was produced about December 1899, within the serial number sequence of the original Carl Zeiss production serial number series established in 1894.

German 6×30 SILVAMAR civilian binoculars, production serial number, 50871, heavy construction, made of brass, black “Vulkanite” schwarzes Kunstleder (black synthetic leather) Körperbedeckung (body covering), brass fittings, manufactured about December 1902 by Carl Zeiss, Jena, Thuringia.

Left prism cover marked in white with “CARL ZEISS” / “JENA” trademark logo.

Right prism cover marked in white with “6 x 30” / “50871” (production serial number) logo.

This Carl Zeiss Silvamar, serial number, 50871, was produced about December 1902, within the serial number sequence of the original Carl Zeiss production serial number series established in 1894.

German 6×30 Silvamar civilian binoculars, production serial number, 150684, heavy construction, made of brass, black “Vulkanite” schwarzes Kunstleder (black synthetic leather) Körperbedeckung (body covering), brass fittings, with small (civilian) bridge locking nut, manufactured about November 1908 by Carl Zeiss, Jena, Thuringia.

Left prism cover marked in white with “CARL ZEISS” / “JENA” trademark logo.

Right prism cover marked in white with “SILVAMAR” / “150684” (production serial number) logo over “6 X”.

Bridge rear spindle button marked “Calderoni & Co” over “Budapest”./

This Carl Zeiss Silvamar, serial number, 150684, was produced about November 1908, within the serial number sequence of the original Carl Zeiss production serial number series established in 1894.

German 6×30 Marineglas military service binoculars, production serial number, 444213, heavy construction, made of brass, black “Vulkanite” schwarzes Kunstleder (black synthetic leather) Körperbedeckung (body covering), brass fittings, with large (military) bridge locking nut, manufactured about October 1914 by Carl Zeiss, Jena, Thuringia.

Left prism cover marked in white with “CARL ZEISS” / “JENA” trademark logo.

Right prism cover marked in white with “MARINEGLAS” / “444213” (production serial number) logo over “6 X”.

This Carl Zeiss Marineglas, serial number, 444213, was produced about October 1914, within the serial number sequence of the original Carl Zeiss production serial number series established in 1894.

German 6×30 Marineglas military service binoculars, production serial number, 453489, heavy construction, made of brass, black “Vulkanite” schwarzes Kunstleder (black synthetic leather) Körperbedeckung (body covering), brass fittings, with large (military) bridge locking nut, manufactured about December 1914 by Carl Zeiss, Jena, Thuringia.

Left prism cover marked in white with “CARL ZEISS” / “JENA” trademark logo.

Right prism cover marked in white with “MARINEGLAS” / “453489” (production serial number) logo over “6 X”.

This Carl Zeiss Marineglas, serial number, 453489, was produced about December 1914, within the serial number sequence of the original Carl Zeiss production serial number series established in 1894.

German 6×30 Marineglas military service binoculars, production serial number, 460270, heavy construction, made of brass, black “Vulkanite” schwarzes Kunstleder (black synthetic leather) Körperbedeckung (body covering), brass fittings, with large (military) bridge locking nut, manufactured about December 1914 by Carl Zeiss, Jena.

Left prism cover marked in white with “CARL ZEISS” / “JENA” trademark logo.

Right prism cover marked in white with “MARINEGLAS” / “460270” (production serial number) logo over “6 X”.

This Carl Zeiss Marineglas, serial number, 460270, was produced about December 1914, within the serial number sequence of the original Carl Zeiss production serial number series established in 1894.

German 6×30 Marineglas military service binoculars, production serial number, 521294, heavy construction, made of brass, black “Vulkanite” schwarzes Kunstleder (black synthetic leather) Körperbedeckung (body covering), brass fittings, with large (military) bridge locking nut, manufactured about July 1915 by Carl Zeiss, Jena, Thuringia.

Left prism cover marked in white with “CARL ZEISS” / “JENA” trademark logo.

Right prism cover marked in white with “MARINEGLAS” / “521294 (production serial number) logo over “6 X”.

This Carl Zeiss D.F. 6×, serial number, 521294, was produced about July 1915, within the serial number sequence of the original Carl Zeiss production serial number series established in 1894.

German 6×24 D.F. 03 Dienstglas military service binoculars, production serial number, 561xxx, heavy construction, made of brass, black “Vulkanite” schwarzes Kunstleder (black synthetic leather) Körperbedeckung (body covering), brass fittings, manufactured in 1915 by Carl Zeiss, Jena, Thuringia.

Left prism cover marked in white with “CARL ZEISS” / “JENA” trademark logo.

Right prism cover marked in white with “D.F. 03” (“Dopplefernrohr 03″ – Binoculars 03) “Dienstglas” (Service glass) over “Nr.16553” (German armed forces property number) over “U.F.” (“Unteroffizier Fernglas” – Non-commissioned officer, Sergeant, Service glass).

Right prism cover stamped on upper inside edge in very small numbers with “561xxx” (production serial number, very difficult to read).

This Carl Zeiss D.F. 03, serial number, 561xxx, was produced in the last three months of 1915, within the serial number sequence of the original Carl Zeiss production serial number series established in 1894.

German 6×24 D.F. 6x Dienstglas military service binoculars, production serial number, 564625, heavy construction, made of brass, black “Vulkanite” schwarzes Kunstleder (black synthetic leather) Körperbedeckung (body covering), brass fittings, manufactured in December 1915 by Carl Zeiss, Jena, Thuringia.

Left prism cover marked in white with “CARL ZEISS” / “JENA” trademark logo.

Right prism cover marked in white with “D.F. 6x” (“Dopplefernrohr 6x” – Binoculars 6x) / “564625” (production serial number).

This Carl Zeiss D.F. 6×, serial number, 564625, was produced in December 1915, within the serial number sequence of the original Carl Zeiss production serial number series established in 1894.

German 6×30 Silvamar civilian binoculars, production serial number, 582177, heavy construction, made of brass, black “Vulkanite” schwarzes Kunstleder (black synthetic leather) Körperbedeckung (body covering), brass fittings, small (civilian) bridge locking nut, manufactured in February 1916 by Carl Zeiss, Jena, Thuringia.

Left prism cover marked in white with “CARL ZEISS” / “JENA” trademark logo.

Right prism cover marked in white with “SILVAMAR” / “582177” (production serial number) over “6 X”.

This Carl Zeiss Silvamar, serial number, 582177, was produced about February 1916, within the serial number sequence of the original Carl Zeiss production serial number series established in 1894.

German 6×24 D.F. 6x Dienstglas military service binoculars, production serial number, 638965, heavy construction, made of brass, black “Vulkanite” schwarzes Kunstleder (black synthetic leather) Körperbedeckung (body covering), brass fittings, manufactured about September 1916 by Carl Zeiss, Jena, Thuringia.

Left prism cover marked in white with “CARL ZEISS” / “JENA” trademark logo.

Right prism cover marked in white with “D.F. 6x” (“Dopplefernrohr 6x” – Binoculars 6x) / “638965” (production serial number).

Right objective cover stamped on upper inside edge in very small numbers with “184244” (unknown, likely a German armed forces property number).

This Carl Zeiss D.F. 6×, serial number, 638965, was produced about September 1916, within the serial number sequence of the original Carl Zeiss production serial number series established in 1894.

German 6×30 Marineglas military service binoculars, production serial number, 694862, heavy construction, made of brass, black “Vulkanite” schwarzes Kunstleder (black synthetic leather) Körperbedeckung (body covering), brass fittings, with large (military) bridge locking nut, manufactured about February 1917 by Carl Zeiss, Jena, Thuringia.

Left prism cover marked in white with “CARL ZEISS” / “JENA” trademark logo.

Right prism cover marked in white with “MARINEGLAS” / “694862” (production serial number) logo over “6 X”.

This Carl Zeiss D.F. 6×, serial number, 694862, was produced about February 1917, within the serial number sequence of the original Carl Zeiss production serial number series established in 1894.

German 6×24 D.F. 6x Dienstglas military service binoculars, production serial number, 715275, heavy construction, made of brass, black “Vulkanite” schwarzes Kunstleder (black synthetic leather) Körperbedeckung (body covering), aluminum alloy prism and objective covers (black paint removed), brass objective lens rings, manufactured in March 1917 by Carl Zeiss, Jena, Thuringia.

Left prism cover marked in white with “CARL ZEISS” / “JENA” trademark logo.

Right prism cover marked in white with “D.F. 6x” (“Dopplefernrohr 6x” – Binoculars 6x) / “715275” (production serial number).

Right objective cover stamped with “№792878” (unknown, likely a German armed forces property number).

This Carl Zeiss D.F. 6×, serial number, 715275, was produced in March 1917, within the serial number sequence of the original Carl Zeiss production serial number series established in 1894.

German 6×24 D.F. 6×24 Dienstglas military service binoculars, production serial number, 755744, heavy construction, made of brass, black “Vulkanite” schwarzes Kunstleder (black synthetic leather) Körperbedeckung (body covering), aluminum alloy prism and objective covers, brass objective lens rings, manufactured in July 1917 by Carl Zeiss, Jena, Thuringia.

Left prism cover marked in white with “CARL ZEISS” / “JENA” trademark logo.

Right prism cover marked in white with “D.F. 6×24” (“Dopplefernrohr 6×24″ – Binoculars 6×24) / “755744” (production serial number).

Right objective cover stamped with “№755744” (production serial number).

This Carl Zeiss D.F. 6×24, serial number, 755744, was produced in July 1917, within the serial number sequence of the original Carl Zeiss production serial number series established in 1894.

German 6×24 D.F. 6×24 Dienstglas military service binoculars, production serial number, 820405, heavy construction, made of brass, black “Vulkanite” schwarzes Kunstleder (black synthetic leather) Körperbedeckung (body covering), aluminum alloy prism and objective covers, brass objective lens rings, manufactured about October-November 1917 by Carl Zeiss, Jena, Thuringia.

Left prism cover marked in white with “CARL ZEISS” / “JENA” trademark logo.

Right prism cover marked in white with “X.” (Roman numeral 10, October, month of production) then “D.F. 6×24” (“Dopplefernrohr 6×24″ – Binoculars 6×24) / “820405” (production serial number) then “1917” (year of production).

This Carl Zeiss D.F. 6×24, serial number, 820405, was produced about October-November 1917, within the serial number sequence of the original Carl Zeiss production serial number series established in 1894.

German 6×24 D.F. 6×24 Dienstglas military service binoculars, production serial number, 840739, heavy construction, made of brass, aluminum alloy prism and objective covers, brass objective lens rings, black “Vulkanite” schwarzes Kunstleder (black synthetic leather) Körperbedeckung (body covering), brass fittings, manufactured in December 1917 by Carl Zeiss, Jena, Thuringia.

Left prism cover marked in white with “CARL ZEISS” / “JENA” trademark logo.

Right prism cover marked in white with “DIENSTGLAS” (Service glass) / “D.F. 6×24” (“Dopplefernrohr 6×24″ – Binoculars 6×24) over “840739” (production serial number).

This Carl Zeiss D.F. 6×24, serial number, 840739, was produced in December 1917, within the serial number sequence of the original Carl Zeiss production serial number series established in 1894.

German 6×30 Silvamar Dienstglas military service binoculars, production serial number, 842083, heavy construction, made of brass, black “Vulkanite” schwarzes Kunstleder (black synthetic leather) Körperbedeckung (body covering), brass fittings, with large (military) bridge locking nut, manufactured about January 1918 by Carl Zeiss, Jena, Thuringia.

Left prism cover marked in white with “CARL ZEISS” / “JENA” trademark logo.

Right prism cover marked in white with “SILVAMAR” / “842083” (production serial number) logo over “6 X 30”.

This Carl Zeiss Silvamar, serial number, 842083, was produced about January 1918, within the serial number sequence of the original Carl Zeiss production serial number series established in 1894.

German 6×30 Silvamar military service binoculars, production serial number, 857654, heavy construction, made of brass, black “Vulkanite” schwarzes Kunstleder (black synthetic leather) Körperbedeckung (body covering), brass fittings, manufactured about January 1918 by Carl Zeiss, Jena, Thuringia.

Left prism cover marked in white with “CARL ZEISS” / “JENA” trademark logo.

Right prism cover marked in white with “SILVAMAR” / “857654” (production serial number) logo over “6 X 30”.

This Carl Zeiss Silvamar, serial number, 857654, was produced about January 1918, within the serial number sequence of the original Carl Zeiss production serial number series established in 1894.

German 6×30 Silvamar military service binoculars, production serial number, 970461, heavy construction, made of brass, black “Vulkanite” schwarzes Kunstleder (black synthetic leather) Körperbedeckung (body covering), brass fittings, manufactured about August 1918 by Carl Zeiss, Jena, Thuringia.

Left prism cover marked in white with “CARL ZEISS” / “JENA” trademark logo.

Right prism cover marked in white with “SILVAMAR” / “970461” (production serial number) logo over “6 X 30”.

This Carl Zeiss Silvamar, serial number, 970461, was produced about August 1918, within the serial number sequence of the original Carl Zeiss production serial number series established in 1894.

German 6×30 Silvamar military service binoculars, production serial number, 980004, heavy construction, made of brass, black “Vulkanite” schwarzes Kunstleder (black synthetic leather) Körperbedeckung (body covering), brass fittings, manufactured about September 1918 by Carl Zeiss, Jena, Thuringia.

Left prism cover marked in white with “CARL ZEISS” / “JENA” trademark logo.

Right prism cover marked in white with “SILVAMAR” / “980004” (production serial number) logo over “6 X 30”.

This Carl Zeiss Silvamar, serial number, 980004, was produced about September 1918, within the serial number sequence of the original Carl Zeiss production serial number series established in 1894.

German 6×30 Silvamar military service binoculars, production serial number, 987813, heavy construction, made of brass, black “Vulkanite” schwarzes Kunstleder (black synthetic leather) Körperbedeckung (body covering), brass fittings, manufactured about September 1918 by Carl Zeiss, Jena, Thuringia.

Left prism cover marked in white with “CARL ZEISS” / “JENA” trademark logo.

Right prism cover marked in white with “SILVAMAR” / “987813” (production serial number) logo over “6 X 30”.

This Carl Zeiss Silvamar, serial number, 987813, was produced about September 1918, within the serial number sequence of the original Carl Zeiss production serial number series established in 1894.