|1973 Topps #247, Del Unser (front)
Unser played great defense for most of his 15-year career and stuck around as a pinch-hit specialist long enough to be part of Philly's first title in 1980. He owns the off-field distinctions of being traded by Texas during the 1971-72 off-season, before they ever played a game as the Rangers, and then swapped for collector favorite Oscar Gamble prior to 1973.
Nothing unusual about finding Unser's card in my trading box, right? Well, that's until you turn him over.
|1973 Topps #433, Willie Horton (back)
The April Fools joke must be on me, because that's a Willie Horton back, stats and all. I nicked the scan from COMC to save time, but the real Unser/Horton card's on my desk.
|Willie Horton with his statue in Detroit
It's doubly surprising to find these guys sharing cardboard, given that Del and Willie come from different series in the 1973 set, which Topps printed, packaged, and sold separately. Putting both on flip sides of the same card probably meant an error at the printer and it's anyone's best guess what time of year it hit the market.
Del Unser trivia: First player to hit 3 consecutive pinch-homers. Box scores: June 30, July 5, and July 10, 1979.
Willie Horton trivia: Horton wore the same batting helmet throughout his career, repainting it as he switched teams.
I've seen a few other wrong-backed early-70s cards online, but they're more common in the all-at-once sets printed from 1974 on. Any other collectors out there have a favorite mismatched front/back combo?