Bill, per above Reilly rarely seemed to engrave fauna on his guns; he was know for foliate scroll and his engraving seemed always in good taste. I've kept photos of about 230 Reillys which have appeared in print or on the internet over the past 20 years. I've found four with fauna engraved on them (counting 12920) - I would bet this type of engraving was an option in the Reilly catalog up to the early 1870's (not the similar borders on the engraved guns 8052, 12920 and XXXXX).
8052: This is one of the last JC Reilly guns probably 1858; it has Veni Vidi Vici engraved on it which may have been JC's swan song:
Your friend's 12920 (1863)
15272 - Spring 1868 shortly after the opening of 2 Rue Scribe
SN unknown but with rue Scribe, and Paris medals on the label (1868-1871) (is that a rabbit with antlers?
