I wish this was a thing. Getting data such as graded/reviewed on xx/xx/xxxx should be a bare minimum when you look up a cert. Unfortunately you can only guesstimate. Have a look at the grading results thread if you want a rough idea of when certain cert # were graded.
I have a 90xxxxxx cert graded card I wanted to know when it was graded, but even PSA won’t answer me. lol
I found one of these recently too and don’t know where it came from. Which card is it you have? I’ll try to find mine again and let you know what it was.
I remember the Gretzky/Mcnall card was graded in the late 1990s, years after PSA started. As a side note, I believe that later that card was found to be trimmed:(