Picture #33 is a good clue that it's an aftermarket upgrade.
The engraving/matting done by the engraver was done by working around the existing proof mark.
Done at the factory, the engraving would have been done first,,then the metal finish (blue /plating, ect),,
Lastly the totally finished firearm went to the Range for Proof.
The proof mark would be stamped not only into the finish,,which this one doesn't really look like the stamping broke through the bluing.
But the real clue is that the Proof mark was done BEFORE the engraving/matting.
The engraver nicely worked around the already existing proof mark on the frame. The work was done on an already finished and proofed firearm.
The Proof mark would not have been there when handed over to the Factory Engraver(s) for their work..
