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Of some interest actually What we take for granted :https://dralun.wordpress.com/2014/03/21/shaving-in-the-trenches-washing-and-grooming-in-the-great-war/ These are still pretty Kool The Rolls Razor with builtin strop stone.
The blade was about the size of a conventional disposable blade but was solid, hollow ground and not disposable, it incorporated a safety guard.
The company's principal market was a twenty-first birthday present for a young man. Rolls Razor open case. The blade handle on the left is attached to the honing mechanism lever via a spring-loaded bearing. The nickel plated blade on the right side is attached to the honing bar that slides on the red leather strop. The grey honing stone is part of the closing lid. The leather strop and the hone lids are not interchangeable as the blade needs to push against the hone but pull against the strop. The blade has a safety guard with pivot action that allows it to vary the shaving angle while providing safe operation. The head of the blade handle locks perpendicular to the blade using a slide type of action with the spring-loaded bearing providing additional stability. Still found at gun shows; Very nice cross of a safety razor with a straight razor.