PALUNC, To get a definitive read on the proof marks e-mail a picture of them to Mr.CW Harding at info@gunproof.com. Mr Harding is the historian at the Birmingham proof house and has been happy to help out vintage gun owners in need.
If you are having difficulty getting a good pict take the barrels to a window and with your camera set on macro and held in one hand use the other hand to turn the barrels till the reflection in the metal is gone,or at least doesn't obscure the marks. It's easier than it sounds and has worked for me.