Ok, so not actually a card, but from 1973-1977, Dean's Photo Service of San Diego produced a set of 5.5"x8.5" black & white photos of the Padres as stadium give-aways. Much like my local minor league hockey team does, a small selection of photos were released at a time in tandem with a post-game signing session by the players & coaches in question. These were very nice pieces, with great posed photos on the front and a surprisingly detailed player biography and complete career stats on the back of the later years. I snagged this photo in one of the rare appearances of this set on eBay:
Annoyingly, I missed the set the first time I saw it and it went for just around $30. Naturally Winfield is the only pricey part of the set. Recently both the 1973 & 1974 sets popped up on eBay, but the BuyItNow was well over $100 for each, so I'll just have to be satisfied with catching a glimpse.
Oddly, neither Beckett nor the Standard Catalog list all of these sets, so it took some detective work to realize all these sets even existed.