Here is an all original U.S. Navy Colt M1911 from October 1912. Shows a fair amount of honest wear, but still a neat pistol. All matching "H" marks on the barrel, receiver and slide. Rectangular-punched plug and early style guide and spring. Rounded rear sight. Early serial number position, marked up front. Proper keyhole magazine.
The "H" marks on this pistol are Francis Hosmer's markings, and indicate the different parts were all inspected by him (the same person for each part).
Lugers are an entirely different critter. We'd have to see images of the markings you speak of to offer an idea about what the marks are.
Thanks for the answer. I guess what I saw on my gun was an inspection mark too. I thought it was weird because it was on the underside of the slide, and I couldn't decide if it was a cut off 'F', a half of an 'H', or some foreign letter. I've posted it on a couple of luger forums now and no one has had any comment on the mark. Now I'm thinking if I take it apart and look closer I might see more than one.
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