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scott brockelmanthe 300 subjects cards that are not normally found with such backs, are from the later production of the team series that were available after the initial 24 series were distributed. I am not sure how many or which teams were available, the envelopes that they came in vary, some are printed with the team name, others are handstamped, most of the numbers are in the 50 series, but if memory serves me while typing this, I have seen them from the 30's thru 70's so it's quite possible they were issued in many teams and or combinations, as well as much longer than the accepted years of production. As an example their sister offer of W600's which are catalogued as 1902-1911 were offered at least until 1913 in Sporting Life ads, probably as a means of getting rid of excess production.