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Submit This CardCard #2400 is one of the 25 "Mr. October" inscription copies in the set. Every serial number ending in 00 (#100, #200 through #2,500) carries this inscription.
Upper Deck authenticated each signed card with a diamond hologram on the card back. The unsigned insert versions have no such hologram.
The pull rate of roughly 1 in 148 boxes was derived from production math by Post War Cards, the most thorough published analysis of this set.
This card set the template for every pack-inserted autograph that followed in the modern hobby. No insert autograph had been randomly seeded into hobby packs at scale before 1990.