timeline for PSA holders?
 

Posted By: <b>J.McMurry</b><p>Has anyone researched the different PSA holders and estimated a timeline for the changes? In my small collection of PSA's I've noticed about 3 different holders:<br /><br />a.white area on front of flip either has rounded corners or squared corners<br /><br />b. Numerical grade and condition grade are either on one line or 2 lines.<br /><br />c. rear of case either has psa emprinted white into the plastic of the case with a hologram, or it is blank with psa imprinted in silver foil on the flip.<br /><br />d. two types of holograms, 1 with the psa letters and one with the collectors universe logo.<br /><br /> It's kinda silly I guess, but I was just curious if anyone knew of a timeline for these changes or knew of any other differences.