Thanks for the better pics. Based on these new photos, my current evaluation of the stamps is:
1
Co X B.
? A.
U. S. V.
U.S.
1 (strap) 1
Changes from my earlier interpretation:- Still not sure whether the "o" in "Co" is underlined. Looks like there could be an underscore there, but not clear. The Brits commonly underlined superscripted "o" in various stamped or stenciled abbreviations ("No." and "Co." come to mind), but whether this was seen in period US use is well beyond my knowledge.
- The company letter looks more like a "B." than "H." -- but could be an "H," and I couldn't see the period after the letter in the earlier pics
- Still can't decipher the first letter in the first line under the crossed rifles, but the second letter is almost certainly an "A." It looks to me like there are two rather than three letters on this line, so perhaps somebody can suggest what this two-letter abbreviation might have been (not me!)
- I now suspect that on the line after the "U.S." the right hand black stroke may be a misaligned and mis-stamped numeral "1" instead of the left hand stroke of a segmented "V." Does an "11" make sense in this location?
This may be the limit of what photography and Photoshop can offer (or at least what I can offer), so from this point the period experts may be more helpful.