1953 Bowman color question
 

As I am collecting this set and purchasing cards, I am seeing a lot of size variation in the cards, even graded versions, both on the larger and smaller side. Can anyone confirm this is the case with these and I don’t have to worry (at least overly worry) about trimming. Also, if that is the case, how does PSA know what is trimmed and what is not?

Any info would be appreciated!

Grain

I have plenty of 53 Bowmans that are a smidge too large, so it stands to reason an equal number must be undersized without being trimmed. I don't worry about size too much (outside of the obviously trimmed cards), and look closer at the edges and for uneven wear that might indicate it wasn't cut by a machine. PSA will reject plenty of undersized cards that probably are not trimmed