Quote:
Originally Posted by Mikehealer
It is based on the advertising backs and the "number" of subjects stated on the
back. Those that advertise 150 subjects are dated 1909, 350 subjects are dated 1910 and 350-460 subjects and 460 subjects are dated 1911. All others
that do not designate one of the specific numbers (Hindu, Old Mill, EPDG etc)
are dated 1909-11.
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So that's the formula they use, good to know. Yes, I was wondering what formula SGC uses, and also if it is accurate. Sounds like it isn't that simple and sometimes SGC gives it an incorrect date on the label. Thanks!