Aknöpflasche (button tab) — a leather flap, attached by folded tabs and studs through the Dienstglas bridge supports front spindle for attachment to a jacket button to prevent uncontrolled bouncing and swinging, and to keep the Dienstglas from being damaged while the wearer is running.
In addition to the leather Trageriemen (carrying strap), a Dienstglas often had a leather Anknöpflasche (button flap) attached, especially the light in weight 6x30s. All Anknöpflaschen were made of leather.
Some Anknöpflaschen were marked with a manufacturer mark and year of production, for example, with the “E.LEITZ / WETZLAR” logo and “1939”. More rarely, Anknöpflaschen were marked with a Waffenamtabnahme “WaA” stamp of acceptance by the weapons office. Such markings were either embossed or stamped into the leather.