This Remington manufactured open (rear) sight leaf is for the model 512 Sportmaster bolt action rimfire rifle and is in very good condition with some light surface rust specks.  (file photo)

NOTE: Remington model 512 rimfire rifles with the following date codes and/or serial numbers have been observed with this part: N.S.N. (CL) April 1942, (APP) March 1945, (KSS) May 1947, (OSS) July 1947, (BTT) January 1948, (ATT) March 1948, (LA) February 1954, (RB) November 1955, (PC) June 1956, (EF) October 1959, (XF) December 1959 & (PH) June 1961