This Marlin manufactured cartridge stop retaining pin is for the earlier Golden 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 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 Mountie: (1958) R16162

Measures: .071" x .464" long