Possible to know if card was graded before .5 increments?

Hi all,
I'm looking through some cards I recently purchased and there are a couple cards I think could be bumped to a higher half point grade. Is it possible to tell based on the serial number if the card was graded before or after PSA made the switch? For example, one card's serial number is 1552xxxx. Appreciate any help on this.
I'm looking through some cards I recently purchased and there are a couple cards I think could be bumped to a higher half point grade. Is it possible to tell based on the serial number if the card was graded before or after PSA made the switch? For example, one card's serial number is 1552xxxx. Appreciate any help on this.
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Comments
Old is on the same line:
If the grade takes up 2 lines:
MINT
9
then it's the post-half-grade era flip.
WTB: 2001 Leaf Rookies & Stars Longevity: Ryan Jensen #/25