Wow! What a wonderful forum. Every post a significant thought or fact. I thank each of you for your input. I'll try to get a camera and learn to use it to send photos of proofmarks etc. Found a 1975 gun digest which covers german proofs. These all appear to be german, from Suhl proofhouse, with a few additional marks- on barrels- 1039, possible date? crown U, crown W, crown S, Nitro, 16/1, circled 16, suhl in oval with pointed left end, and on underqtr. of bbl next to the plate J M PORT , Possibly hand stamped, different font, 'J' is very clear. On each bbl circumscribed by an oval is some kind of script. Possibly p.St. Now on rec'r,'stage'? each side has a heavily angular styalized capital 'G'. The manyfeathered eagle appears 7 times. 6 on bbls once on stage, all ser.#s match. Many thanks to all of you for the info you've sent and for anything you may interpret from this new information.