[Arran]

They may have been some sort of water slide decal, A friend of mine has an Admiral portable from the same era with the name and insignia of some college football team on it and I think that was what was used. The emblems are not printed on a paper sticker, and at that time they did not print stickers on plastic film. You can do a certain amount of cleaning and restoration to the leatherette, as long as it isn't worn through or torn up, it's kind of like old fashioned linoleum only thinner, a cloth with a thick coating on top.
Someone on the alternative forum has a an International Kadette radio that has decals from a college frat house on it, you know the cliche frat house like you would see in a movie or TV show, that uses Greek letters that don't spell anything. That wasn't why he had it, the reason was that it was one of the Kadette models made infamous for being marketed as a 10 tube radio even though 4-5 of the "tubes" were ballasts.
Regards
Arran