As to the front back combinations for rarity/value it is not as easy as one would think. Normally the two more common Sporting Life backs are found on the first 18 series and then the "300 Subjects" backs on series 19-24, which are the scarce ones. All of these were issued in 1910-11. What is not well known(or in the guides) and overlooked is the fact that Sporting Life also put out many of the 1-18 series cards with "300 Subjects" backs in 1912 and 1913 which are not as scarce as the others. I believe these were issued in the Team Envelopes of the series 80-90 and possibly early team sets 50-70.
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