I was intrigued by the item and won the auction for a little more than $10. While the card is advertised as a proof for his 1990 Topps card, it does not actually match up to McGee's card in the set. The only common thing going on with these two cards is that both pictures are taken in Shea Stadium.
The actual photo proof looked a little bit different than what I anticipated it looking like when I bid on the item. I was thinking it would likely be similar to a photo slide, but it was surpringly pretty close to a regular baseball card in size.
You can from the slight white border around the card that the photo proof is just a tad bit short of being a standard baseball card. The photo proof was also really dark. When my new computer is in two next week I will repost this card as a scan, but I think this picture paints a pretty fair picture.
The McGee photo proof also included the usual Topps Vault certificate and matching silver identification sticker on the item. Really excited to add this cool piece from the Vault to my collection and will keep my eyes out for a few more in the near future.