It's usually called a "sheet number" and just say Factory 30. They are very scarce. I tried to get them before anyone was really collecting them and I finally found one. Then last year I was able to pick up another off the BST
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Please check out my books on baseball history. They include the bio of star second baseman Dots Miller. A book featuring 20 Moonlight Graham players who got into just one game. Another with 13 players who were with the Pittsburgh Pirates during the regular season, but never played a game. There's also one about 27 baseball families, as well as a day-by-day look at the worst team in Pittsburgh Pirates history. All five can be found here: https://www.amazon.com/stores/John-D...hor/B0DH87Q2DS
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