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Jeff OPer Lipset's Encyclopedia, E121s are known with backs specifying both 80 subjects and 120 subjects. He feels it likely that the 80 subjects backs are from 1921 and the 120 subjects from 1922.
It should be noted that the total number of subjects are not accurate, as there are 107 players known with the 80 subjects back and 116 different players with the 120 subjects back... more of each if you include variations.
A very complicated set...
Jeff
http://www.seattlehockey.net