I'm bending my own rules here about cameo appearances on cards, but I have some good reasons.
Card Number 679: Topps Project70, 2021; #61
This is a card of Fernando Tatis, Jr. But I'm including it anyway, for obvious reasons if you look at the card.
So, although this is a 'cameo card', it's a bit different to cameo cards where Tony is in a photo of another player. He has been deliberately included in the artwork, so I'm counting this as a card in the collection, even though, technically, it probably isn't really a Tony Gwynn card.
Total: 679 cards