Marlin 81, there are the 81, 81C, 81DL, & 81E versions
Made from 1937-1970
First two numbers in the serial -25 equal the date of MFR.
Pillar bed it, do a trigger job if needed, mate the ammo to it (find the rifle's favored ammo)
and you'll be able to outshoot most CZ's.
Try Wolf Match, Eley Standard Velo, & CCI Standard Velo for better than average results.