Jeff, some more investigating confirms Signore Bregoli worked almost 40 years for Beretta and did not leave followers of the technique he used, called "sbalzo", that means "jump, rebound" and which is not used a lot for engraving guns. This according to Mario Abbiatico in his book "L'incisione delle Armi Sportive".

Maybe Barry can comment on the technique.

JC

"...it is always advisable to perceive clearly our ignorance."ť Charles Darwin