According to my photo references, the Seals started using that style of Jersey lettering in 1923 (the previous year they wore an interlocking "SF"). I also have a photo of Smeed Jolley in the same jersey and he played on San Francisco from 1924-29. There is an Earl Averill Zee Nut card from 1927 that shows him wearing a similar jersey but the letters are san-serif. So it can possibly be narrowed down to 1923-1926.
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