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Two versions of the same card, three lots apart, and the one with 186 graded copies lost to the one with 5,252. In hockey the same comparison runs the other way.

The barge story is the standard explanation for why the 1952 high numbers are scarce. The population report shows something different, and so does Topps' own mail-order catalogue.

A qualifier marks a card that met the standard everywhere but one place. That is why they pile up at 8 and 9 and disappear entirely at the top.

O-Pee-Chee printed 396 cards a year while Topps printed 264 and then 198. The difference decided which players got a card at all.

Across eight cards with full four-grader tables, PSA holds 94 per cent of every ten recorded. The published rates say something quite different.

All 132 cards ranked by gem rate. The Jordan is hardest by a hundredth of a point, Andrew Toney is seven times easier, and the printing sheet does not explain any of it.

Mantle, Robinson and Thomson were printed twice to fill the last sheet of 1952. You can still see which impression you are holding.

There is no formal definition. The rules everyone quotes were invented by price guide publishers, and they produce results nobody would defend from first principles.

Three ways the packaging ruined its own contents, and the antitrust ruling that accidentally put a stop to one of them.

Every set on this site is named by a system one man invented. He was an electrical assembler in Syracuse earning about a thousand dollars a year, he never married, and when he died in 1963 neither of his hometown newspapers ran an obituary.

One season with no licensed cards at all, three years of team bags sold through dealers, and then a single 132-card set that had to hold five years of arrivals.

1,317 graded across 68 cards, no PSA 10 anywhere, and not a single published figure for how many were printed.

13 June 1948, a stand-in photographer, and a card that went on sale after its subject was buried.

Three exist. The last documented sale was $275,000, twenty-five years ago. Everything written since about what they would fetch is an estimate with no transaction behind it.

Card 101 sat in the top left of the sheet and on top of the bag. Both are why almost every copy is short, off-centre, and worth less than someone will tell you it should be.