This Marlin manufactured hammer screw is for the Golden (39A and 39-A) Mountie lever action rifle in 22 rimfire caliber and is in very good condition exhibiting a grayish brown patina with light wear.  (file photos)

Note: Marlin Golden (39A & 39-A) Mountie lever action rimfire rifles in 22 caliber with the following years of manufacture and serial numbers have beeen observed with this part:

Marked Golden 39-A: (1958) R16162

Marked Golden 39A: (1966) AB10631