My honest take on it is that it's an Italian reproduction Richards-Mason mated with a Colt Signature Series grip and perhaps other parts. What does the barrel address say? The cylinder does not seem to be properly stamped for a Colt and the numbers on the bottom seem very odd for any kind of Colt I've ever seen.
Hopefully someone more knowledgeable than I can chime in.
Best,
Oly
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