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fkwThe 1925-31 date is brand new, through research the date was widened on the PC-Back Exhibits (used to be 1926-29). The catalogs will/should eventually catch up and update their info.
There are a few names the set(s) go by. Lipset among others breaks the 1925-31 set down even farther. They call them "Set 81", "Set 82", "Set 83", etc. But I still cant tell for sure which subset some of the cards are from.
Example of Lipset's http://www.oldjudge.com/auction/180/
Can someone with some time show and example of each subset and explain what the differences are?