Any guesses?

[Mossyrock]

As to who built this one?








No further info.  What you see is what I have.

[RebHolister]

It looks like a old uberti that i have.

[Don Nix]

Both of my Navy Arms 58s were amrked the same way and both turned out to be Piettas.
I bought a loading lever for a Uberti from VTI and it was a tad too short. Bought Pietta nad all was well.

[Montana Slim]

My Navy Arms was simialrly maked...when I purchased it in kit form. While finishing, I removed all the markings.
But, there is still a tiny "FAP" within a diamond shape, barely visible on the front of the cylinder, between chambers.
Vintage on my revolver is 1980 or before.

Slim

[Sir Charles deMouton-Black]

This is from my bookmark collection;

https://store.bluebookinc.com/Info/PDF/POWDER/MBPProofmarks.pdf

[Mossyrock]

OK, based upon Mr. Adler's article, there is nothing in these photos that identify the manufacturer...   I have requested more info from the seller, but have yet receive a reply.

[Mossyrock]

From the seller: "Under the loading lever it is marked C.O.M.-"

Which still tells me precisely nothing....

[Fox Creek Kid]

It looks like a old uberti that i have.

My vote as well.

[Wolfgang]

If you have the opportunity to do so try swapping in cylinders from guns of known makers.   Pietta, Uberti, Armi San Marco, Euroarms, . . . . they are all slightly different . . . If one from a known maker fits. . that you know who made yours.   

[Hoof Hearted]

This is from my bookmark collection;

https://store.bluebookinc.com/Info/PDF/POWDER/MBPProofmarks.pdf

Excerpted from the above excellent source:

"For Fratelli Pietta, another of Italy's leading
manufacturers of black powder pistols and long arms, the
initials FAP contained within a horizontal diamond
identify F.LLI Pietta; often followed by F.LLI PIETTA in
capital letters."

[Drayton Calhoun]

I have one virtually identical, Navy Arms, 1980, Pietta Cylinder, barrel, loading lever near perfect fit. On mine, the frame had an almost purplish tint to it before I refinished it.