5 bizarre baseball cards from the ’90s that left collectors speechless

Brian Downing’s Baffling Diamond Kings Double

Here’s a collector’s headache: Brian Downing found himself with not one, but two Diamond Kings cards in the 1990 Donruss set. In a plot twist worthy of a detective novel, one card shows Downing batting left, bearing a cryptic artist signature that looks like « zɘɿɘᑋ,” while the other card shows him batting right, proudly autographed by hobby legend Dick Perez. But here’s the punchline — you’ll never spot Downing’s own signature on either card. Or, at least, it’s about as rare as a unicorn sighting. Downing, now 74, isn’t exactly known for refusing autographs (his other signed cards fetch a modest $10–$20), but the Diamond King? He’s just not a fan of signing this one. That, plus the army of collectors hunting down signed Diamond King sets, means the card commands a real premium, whether or not Downing ever changes his mind.

The Jordan Upper Deck Curveball

Remember the annual chase for the “must-have” rookie card? 1989 had Ken Griffey, Jr. 1990, Ben McDonald and, for a hot minute, Kevin Maas. By 1991, everyone expected the year’s prized Upper Deck card to belong to a top baseball newcomer. Spoiler: it turned out to feature a basketball player! That’s right — Michael Jordan himself, on a baseball card, thrown into random Upper Deck packs as card « SP1.” If you happened to find one (they appeared in just 1 in every 72 low-number series packs, about 35% scarcer than regular cards), you hit the jackpot. Copies in nice shape still pop up today for less than $20, but if you’ve ever searched for that flawless, PSA 10-graded specimen, only a couple of thousand exist. The result? A mint copy will set you back $400 or more — not bad for a basketball card disguised as a baseball chase.

Rare Prototypes and Military Goldmines

In 1991, Pacific Trading Cards released a tiny batch of ten prototype cards, featuring the likes of Rickey Henderson, Frank Thomas, and Dwight Gooden, mimicking their football card design. According to the hobby grapevine, just 20 sets exist, so scoring any single card is a feat worthy of the record books. Ambitious “Man of Steal” collectors might also try hunting down the equally elusive Spanish-language version — just in case you enjoy a challenge (or pain).

Over in the world of “printed into infinity” rookie cards, even the Braves’ own Chipper Jones saw his 1991 Topps rookie tossed into dollar bins. Yes, there are literally mountains of the standard version. But here’s a twist: if your card features a second logo for Operation Desert Shield (right below the #1 Draft Pick mark), you’ve struck rare-card gold. These special cards, distributed to troops deployed in Iraq, have an estimated print run just over 6,000. A PSA 10 “Desert Shield” Chipper Jones rookie can fetch $10,000, and even a mid-grade PSA 5 has sold for over $600. Suddenly, that beat-up card in the attic is looking a lot more interesting.

The Secret Inserts Nobody Saw Coming

Let’s end on a personal note. In 1991, you might have heard rumors about “Elite” and “Signature Series” cards — but nobody opened a box expecting to find them. Nothing on the packaging hinted at hidden treasures like a rare Nolan Ryan or an autographed Ryne Sandberg. It was pure, accidental magic: one day you just cracked open a pack and there they were, despite the utter lack of fanfare (and the total absence of internet spoilers). Back then, a Nolan Ryan Elite was about as legendary as cards got; even though values have dipped since ’91, these inserts still spark genuine nostalgia and rank among the era’s most sought-after pieces.

This wraps up the latest trip down cardboard memory lane and Impossible Cards, but stay tuned — there’s plenty more weirdness to come. Keep checking back at Collectibles on SI, and, as always, don’t forget to get your hands dusty digging through those old shoeboxes.

Jason A. Schwartz is a collectibles expert whose work can be found regularly at SABR Baseball Cards, Hobby News Daily, and 1939Bruins.com. His collection of Hank Aaron baseball cards and memorabilia is currently on exhibit at the Atlanta History Center, and his collectibles-themed artwork is on display at the Honus Wagner Museum and PNC Park.