B Ranelagh,

Welcome to the Board. Plenty of knowledge, freely shared here, as you see above. Be interesting if you can take the barrels off the gun and post some pictures of the barrel flats and the action flats as well as the engraving and the barrels to have a look at the pattern in them.

There's a primer on posting photographs, which must be digital and uploaded to a website such as photobucket.com that hosts pictures first.

Regards, Tim