Compare with my rifle at:
http://americanlongrifles.org/forum/index.php?topic=2135.0
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Best I can make out without undue removal of patina...
Signature is enclosed * ? M * Possibly * S M *
The second character appears to be a stylized script consistent with an M. Certainly rather fancy with whorls that might lead to the conclusion it was a "W" The first character is there, but so lightly imbedded into the metal that I can't make it out.
My patchbox is pinned. No screws. This being the major difference between rifles, except that mine is less decorated.
Wearplate, ramrod thimble, muzzle treatment, and overall architecture follow almost line by line.
The supposed lost pick area is more likely a missing inlay. My gun has a thin brass inlay in the exact same area.
My barrel is almost exactly 36" from muzzle to breach plug and is of roughly .45 caliber. While short by long rifle standards, the rifle has not been molested. The signature area lies just forward of center between the breach plug and rear sight.
My lock follows flint tradition with two screws as does this rifle. Given what the photos show and given what I see in my rifle, I stand by an original mule ear converted to flint.
Whoever made either of these rifles had a knack for utility and balance. While I love the longer rifles, my mule ear would be my choice afield. It enjoys superior balance and is a pure pleasure to hold.
On the downside I doubt OSHA would approve of the lock mechanism.