Curly George, I was thinking of lost wax casting a metal form to which I'd pound a bar of steel to form the touchmark.
Mattbower, that's what I was afraid of. I don't think I can cast anything but aluminum or lead but then again I've never tried. I was thinking it may be possible to case harden the mold if it I could cast in mild steel. It would seem that a case hardened base would hold up long enough to allow a high carbon touch mark to take the impression but I've never tried it.
781, I'm thinking of a shield with my initials overlaid. Although pre-made type sets would definitely work, I was hoping for a more custom looking lettering. If possible I'm hoping that the shield would end up curving outward with my initials slightly proud of the surface.
Phillip, those folks look like they're doing an amazing job! Still I'm sort of bitten by the bug to do this myself. Now that I've seen truly awesome work, I'll have to try especially hard.