The pictures came of pretty flimsy paper, not on card stock, that measured 4¼" x 7". They're also not that great to look at since they are black and white. There is no printing on them anywhere, so I guess the only way to tell the year of issue is by the photograph.
Just to be safe, I did some poking around ebay before I bought the photo. I found this..
With one more added, I'm up to 68% of the PSA Master List, 86/127