WWI French binoculars made for the British Royal Air Force by Geraisme and Foch of Paris.  Objective lenses have large, sliding, antiglare lens cover.  Left lens tube is precisely engraved:   Royal Air Force.  Right lens tube is precisely engraved with a Sopwith Pup biplane fighter.  Lenses are crystal clear.  Center wheel focus.  Only wear is to leather covering next to adjustment wheel on left lens housing.  Includes original leather case with strap.  Excellent. $500