Here is a strange watch-a half pound, brass cased, magnifying crystal, 17 jewel Swiss movement. It's case is abt. 55mm dia.,movement abt. 24mm dia., heavy convex crystal, case is solid, lathe turned brass. The Jerger name is printed on what appears to be a paper face. It runs about two days on a winding. Would it be a custom factory made creation or even a non factory job? Any ideas. It appears like maybe a 50's item. Thanks for any clues.