619a: No copyright on back.
619b: Copyright on back, no wavy line on helmet
619c Copyright on back: wavy line
619a is missing the copyright on the back of the card, it should be listed after Dick Drago on the bottom right corner. Every version I have seen is also missing all the black from the helmet on the front making it easy to recognize from either side.
619b has the copyright listed after Dick Drago, but is missing the black squiggle coming up from the helmet's brim on the front of the card.
619c has the copyright listed after Dick Drago, and includes the squiggle on the helmet.
The O-Pee-Chee versions have the same 3 variations as the Topps cards, but I have no scans of them.
|No Copyright Front|
|No Copyright Back|
|Wavy Line Front|
|No Wavy Line Front|