I’ve got a Model 80.... but... it’s not a JC Penney store-model, it’s a Marlin 80 which my Father bought new in1939. Nice dark walnut, deeply blued with chromed bolt, and NO SERIAL NUMBER. (Serial numbers were not required back then.). It’s in excellent condition and also a tack-driver.
PS: The magazine has a metal follower, not the orange plastic todays mags have. And it’s pre-Micro-Groove, of course.