What is the value of a Diamond 12gauge shotgun?

Answer 1

If you are asking about one of the Diamond series automatics or pumps imported from Turkey in the last 4 or 5 years, I can't help except to say they seem to be moderately priced in new condition. I will assume you are holding a Diamond Arms single or double barrel shotgun c. 1890-1914. These were made for Shapleigh Hardware Co of St Louis by various manufacturers in the US and Belgium. Some will be hammerless, some back-hammer boxlocks, and some open-hammer sidelocks. There will be damascus, twist, and fluid steel barrels. A newer gun with fluid barrel may still be useable, but most should be retired and are valued only as a mantle decoration. Double barrels usually trade for $150-$250 and single shots for $25-$100 depending on condition.