German Binocular Strap & Keeper Set tool It is a rubber case

It is a rubber case to protect spare spark plugs and keep them ready for use

It does have staining and storage wear (mainly along the fold lines)

Made from mahogany colored Bakelite

All are marked "Czechoslovakia  Bohemia Works  Toison D'or Colorama : 5217"

They measure about 1" across

German Binocular Strap & Keeper Set tool It is a rubber caseMade in USA! Reproduction German binocular strap and keeper set. The button keeper is designed so you can wear the binoculars around your neck and button them to a tunic button when not in use so they don't flop around. A very useful feature. The keeper is marked kem 41 with a waffen amt. We positioned the markings based on an original, although there were variations.