Not sure about Byrd in the Prime Cuts, but that seems to be a good Litmus test.
Incidentally, there was a Mark "the Bird" Fydrich auto in Century Collection. . . .
If you have to explain why it's a 1/1, then it's NOT a 1/1.
Looking for Andre Dawson Serial numbered cards that are his jersey number - either #8 or #10. So looking for cards like 8/8 or 08/99 or 10/250.