BarclayG,
OK...the the photos are on their way...the courier learned to be an engraver under Mains and Swan...he too thought it could be a G&R gun and said it looked like Main's work...still though, your best bet may be to send the photo's directly to Bill Mains. After posting last, I read Mains history which stated that he invented the rotary engraving chuck in 1959. I have that very rotary vise he made in '59 built right into my smithing bench if anyone would like to see photos of it.
C Roger,
I haven't spoke with Ray Swan in many years (10 or so). Last I spoke he was buried in self inflicted engraving work where he agreed to do two matching guns. He explained that doing one gun is easy because you have artistic license, but when you agree to two matching, dead-nuts accuracy must be acheived on the second gun. By the way, Ray usually signed his work with a microscopic silhouette of a swan (not much of a strech there)
I really hope this pans out for Barclay