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MattThere is a checklist in the SCD bible. From what I gather, each one was available for a year, with some players reprinted in later years in different poses. In theory, if you had a visual checklist, you would be able to know exactly what year it was issued in due to the unique pose. According to SCD they were issued from 1910 through 1957 and, while the number was variable, it looks like, on average, about 20 each year.