Hi Rick,
Thanks for your further comments on this piece .
I can find no evidence of remains of any kind of pin under the barrel or where it lies (smooth with some old rust) but I do see some faint marks on the stock about an inch and a half in from the business end, though they look a bit like impressions made by wire possibly . That being said there is no change in the patina of the wood; this pistol has been in my family's possession for probably 125 years so if it (the barrel band) was lost earlier that could account, I guess for the uniformity of the patina .
I want to thank you all for your help with this pistol .
Rick