This Marlin manufactured late variation finger lever is for the later model 39A lever action rifle which uses the late variation finger lever mounting screw and is in very good condition exhibiting a grayish brown patina with light wear and traces of original blue finish in protected areas.  (file photos)

Note: Marlin model 39A lever action rimfire rifles with the following years of manufacture and serial numbers have beeen observed with this part:

Marked 39-A:

Marked 39A: (1951) H14371 & H24038