Here's A Puzzle
 

I've been trying to research a postcard set and a single postcard I bought many moons ago, and cannot find a thing. The cards are a numbered set of black and white images of the heavyweight champs from Sullivan to Patterson. I also got a Cassius Clay card that was clearly not part of the set, depicting Clay in Olympic wear. It has a Kodak Photo Post Card divided back. This one has a similar back:

https://photos.imageevent.com/exhibi...970s%20Ali.jpg

I will scan and post the others when I get back to the office next week. In the meantime, any ideas?

I don't know if it could be related, but the June 1957 edition of Boxing and Wrestling magazine ran an article entitled "The Heavyweight Division: The Complete Story from Sullivan to Patterson."