I collect nearly all of it.
And I do have parameters on some stuff, but they're hard to explain.
Anything that is from some difference on a plate I save with a set, The same for other stuff that's recurring.
A few examples
93 Upper deck has for a portion of the set, either
gloss only over the picture on the back.
Overall gloss on back
gloss over he picture but then covered by all over gloss.
88 Score the cards were "cut" from the sheets by 3 different die cuts
AND
have screening differences both front and back.
Most of the Gypsy queen sets are on two different types of cardstock, it's a very subtle difference.
different inks like 91 Topps
Any thing that's a printing error, I usually keep in a different box. Blank backs blank fronts, wrong backs, bad registration, creased before printing, die cut at the wrong end, missing foil stamps, wrong foil stamps....
Some of those are always really obvious. Some I don't actively go after anymore.
Others, like registration errors have to be pretty severe for the issue for them to be interesting to me. Like the cards above, the one on the right with red printed low would probably get saved, the one on the left and previous with a for the 50's trivial shift wouldn't. That same shift on a 2018 card would get saved, registration is so much better today that it would be interesting.
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