A crown with letter B then another crown with letter U on undeside of a single shot pistol owlhead wood grips very crude small cal overeall length 4 in?
The Crown with assorted letters is a Proof Mark. This system was used in Europe to show that a firearm had been inspected and test fired in the government proof house. Unfortu…nately several nations used a crown. The balance of the description is not enough information to give you an accurate ansswer. Your best bet will likely be to take this to a gun show or gun shop for an evaluation by them. ( Full Answer )