I have a very similar Euroarms (the DGG is under the lever arm). The Gardone proof stamp and the Black Powder only stamp on the right side of the barrel are identical. I have in addition to the DGG stamp under the barrel some numbers which don't correspond to any numbers in the serial number stamped on the frame. My cylinder has the same stampings for proof.
The frame has the proof stamp, the PN and the date code (XXX).
You probably have an older version of a Euroarms revolver that has had some defarbing.
The frame has the proof stamp, the PN and the date code (XXX).
You probably have an older version of a Euroarms revolver that has had some defarbing.