Wehrmacht issue gasmask reinforcement strap slide.
First introduced on September 8th 1936 (H.M. 1936. Nr. 585) this is the improved model from 1940.
8cm x 2.8cm and unmarked.
The slides were discontinued on 17th June 1942 by a Luftwaffe Verordnung (LV 42. No. 1641).
Additional paperwork not for sale, just showing how this small item was used.