I think Stephen Grant would be rolling over in his grave.....

Firstly, I'd like to congratulate you on the photo layout, a good many new posters expect mind-readers here, but you have made it as easy as possible to make a fair assessment of the gun in question. However... !

It's an interesting old heirloom, but the fairly 'ordinary' standard of engraving and general lack of build quality are not indicative of a valuable gun.

Hard to tell from the photos, but it looks loose, and the breech-face is rather untidy. Are there any dents in the barrels? What are the bores like?

Some of the guys here are proof-mark gurus, and they will no doubt give you a window for date of manufacture.

Welcome to NE.com BTW, Ian. Although your first replies may not be overly encouraging I'm sure you'll find plenty of interest here if you stick around.