I have several Remington double's in 16ga.and this one looks like a 12ga. maby a 16ga. My 1889 16ga. on a lightweight receiver has thicker sidewalls in the chamber area than the one in the picture. This I think is an original 1889 grade 1(no way it is 98+ condition) that someone refinished and blued the receiver also. From 2nd. picture look's like the lightweight receiver.