I've seen similar markings on Spanish revolvers. That's my bet, but I'm not certain.

There's a book out there on Spanish revolvers I've been meaning to get- just rarely see enough Spanish made S&W and Colt copies for sale, since usually they are of lesser quality gunshops around me will not put them out or refuse to trade for them. There are actually some that are fairly decent in quality, but they are less commonly encountered.

What's that quality of that one Dan?

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Lost it all in a boat accident