The gun weighs approx. 6 1/2 lbs , has 28 inch barrels and is small framed. The right barrel is .713 & the left is .684 ,there doesn't seem to be much of a forcing cone ,looks to be 1/8/ to 3/16 inch. Thats what I first noticed.My other British guns have longer ones.The proof marks are a crown over BP,a cross with a crown on top a "B" on the left a "C" on the right and a "P" on the bottom and a cross with a crown on top and a "V" on the bottom.