Hi all,
I'm looking for a good reference that shows images for all of the PSA, SGC, and Beckett flips that have been used since the inception of third-party grading.
I found this site that shows images of the PSA flips but have not been able to find something similar for SGC and Beckett.
https://allvintagecards.com/history-of-psa-flips/
Does anybody have a resource they could share?
thanks,
jeff