Funny you should mention '83 Topps. I bought some cards from a collector on Craiglist including an '83 set. This guy bought cards from packs and built sets from the late 70s through the 80s. Absolutely no chance he trimmed cards or subbed in a trimmed card. One of the '83 Gwynn's has a flared corner that would probably come back "trimmed." I seem to remember as a kid growing up in the mid-80s that occasionally you would get a wierd cut on a card. Here it is. My thought is that maybe your one card was just sort of a bad factory cut.
