I looked up US Patent Firearms Manufacturing Company (USFA) and found they were incorporated in 1993, which was earlier than I thought, and the company was officially dissolved in 2017, which was later than I realized, although they apparently stopped making Colt-style single-action clones in 2011. I would still maintain that they just lost their focus. If in doubt, look up their "USFA ZiP .22" firearm. They should have stuck with single actions...
If anybody is interested, this is the USFA percussion revolver manual I mentioned in post #35:
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It is a small, pocket-sized manual, four inches by six and one-half inches, and 44 pages long.
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Somebody put a lot of thought into writing this. Most of the directions are written in a very authentic 19th century prose, with loading, cleaning, and maintenance instructions, and the illustrations look "period":
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I guess the significance of this would be that USFA must have been seriously intending to produce percussion revolvers at one time. As noted previously, this publication was in the box with a Colt-style .38 Special revolver I got from them. It was certainly put in the box with that gun by mistake, but it is actually a dandy little booklet, and I'm glad to have it.
Best regards,
Notchy Bob