Shooter13,
I have a J C Higgins rifle sold by Sears that I think is the same as a Marlin 80C. I picked it up recently at a pawn shop. It is in wonderful shape for a rifle that I think is about 55 years old. I believe mine is from the middle 50's because it has Micro Groove rifling, making it after 1953, and it has a 24 inch barrel, which I believe was changed to 22 inches about 1958. At least I hope this is correct. If anyone has any other way of nailing down the date of manufacture, I would appreciate it.