are these print marks or stains on 1958 Topps baseball cards???

I have a number of 1958 Topps baseball cards that have stains or printmarks on the back. Here are a few scans. Are these printmarks?? or stains or wax?? could they possibly be from rubberbands?? can anyone help. thanks al.




0
Comments
Mike
Rubber band marks seem plausable.
Steve
I doubt very much that they are 'print' mrks.
Steve
Donato
Donato's Complete US Type Set ---- Donato's Dansco 7070 Modified Type Set ---- Donato's Basic U.S. Coin Design Set
Successful transactions: Shrub68 (Jim), MWallace (Mike)