You forgot to add if there was any stamping on the barrel rib. It is unusual that there is absolutely no stampings on the gun other than a single letter here and there? May be that the gun was refinished at some point in time and all the markings were removed?? Belgium was a major manufacturer of S&W copies, but there is usually a ELG stamping on the rear of the cylinder, but yours does not have one. I would suspect that the answer still remains the same, Spanish copy. Caliber should be 38 S&W.

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Gary
SWCA 2515