Quote:
Originally Posted by Peter_Spaeth
PSA has gone through about 10 different flip designs, I am sure you can find them here or on the web. Won't help too much on some with a wide span but can at least provide some baseline information about range.
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I dug this one up, seemed to be the most recent I could find. Date ranges included on some but not all.
https://allvintagecards.com/history-of-psa-flips/