Lot of 250+ Vintage 1979 O-Pee-Chee Hockey Trading Cards NHL OPC

This is something that I picked up from a garage sale! I dont know much about it but its a pretty unique item! All the cards vary in condition! I dont know which cards are which and have already packaged them so please only purchase if you are happy to receive the cards shown in the photos :-) Conditions may vary from damaged to good considering they are above 40 years old; Thanks!