A true Winchester Model 12 Trap, SN (12100XX) shown it is made in 1949. LOP 14 3/8". DAC 1 1/2", Drop at the end of MC is 1 5/8", and DAH is 2 1/4". FULL Choke. Ask $1500 shipped to CONUSA
I think most old timers (including myself) referred to this as a Milled Reciever model 12 , and your price is right on. Good luck with your sale.