In order to get one of these you either had to buy a box of of 1993 Stadium Club or get a mail-in redemption card which were inserted 1 in 24 packs. The mail-in card got you 3 of the Master Photos.There were 30 of these in the set, of which I have 11. In Beckett, they don't carry much of a premium over the regular card. Beckett lists the Nolan Ryan card at $3 and the Master Photo at $5. These are big, 5" by 7". The 'Master Photo" card features the same photo as the player's regular card but the photo area is a bit bigger. The regular card is cropped at the on-photo gold foil border. Here's what the regular Ryan card looks like:
These are available on eBay. Someone is offering 25 copies of the Mark McGwire for $4 plus $6 for shipping. The McGwire books at $3 so its a pretty good deal. Someone else is offering two packs of these with Bonds, Strawberry, Clark, Canseco, Boggs and Tartabull for $99.99. I'm temped to ask him a question. "Are you kidding?"