How to tell age of PSA graded cards, numbering system

[uhlhockey]

Was wondering if there is a way to tell the year or date of when a PSA baseball card was graded with the "cert" numbers on each card? Has there been a consistant numbering system used that could place a card in an age range?
.....Reason I ask is, I am a huge collector of the 1962 Topps Baseball "green tint/Variation" cards, and I have about 200 or more that are the "green tint" but are not properly labeled that way.
.....I wanted to enter my sets in the PSA set registry under the 1962 Super set catagory which contains the green tints but can't because they are not labeled correctly.
....Finnally after months of back and forth with PSA, I was told that prior to June of 2012 they did recognize the green tints and then after that they did.
.....anyway if they were graded prior to that date then I pay for new label, if after June of 2012 they will pay.
.....Only thing is, they won't tell me how I can tell by the 'cert" number weather it was before or after that date.....
....Thanks,
Joe