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					Originally Posted by glchen  With PSA, I believe the serial numbers actually do correlate with the timing of the submission.  The smaller the number, the earlier the submission. 
Ironically, just today in the PSA forum, a poster has a thread on the history of PSA flips: Linky | 
	
 Yes and no... PSA certification numbers do go in order... however when a flip is returned as a card that was crossed over, that certification number gets reused... thus an original early certification number can now be used for a card that was graded just last week for example.