This Remington manufactured rear sight base is for the model 12 slide action rimfire rifle and is in very good condition exhibiting a grayish brown patina with surface rust specks and light wear.  (file photo)

Note: Remington model 12 takedown slide action rimfire rifles with the following serial numbers have been observed with this part: 126670

12-A: 30310, 374065, 570191, 741138, 802984 & 806842

12-C: 303506, 597770, 600364, 663586, 722004, 789956 & 830348