Numbering system as explained on wiki.
"Topps generally put the biggest stars on card numbers ending in x00 or x50. For example in the 1966 set, Mickey Mantle is card #50 and Sandy Koufax is card #100. In 1965, Willie Mays is card #250. Other star players were put on card numbers ending in zero (10, 20, 140, 270 , etc.) and minor stars were put on cards ending in "5". Topps continues this numbering system (at least to a degree) today."
Aside from that, th number 7 is permanently set aside for Mantle. Not sure if there's an exact system for first cards, but it's usually a star or commemorative..
As far as the in between numbers, I haven't the slightest clue how they're chosen.
Last edited by novakjr; 04-15-2012 at 09:49 PM.
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