That was my assumption, but I've found instances when the non-baselined 1 label was given an earlier attribution. This Walter Johnson bat, for instance, was dated to labeling period 1925-31...
http://catalog.scpauctions.com/lot-184.aspx
Quote:
Originally Posted by earlywynnfan
Looks like a 1929-on, based on the non-base line 1 in 125
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