Looking at VCP, I found a Washington W601 with an April 1907 date stamp, which is before the date of the article (and two with later 1907 date stamps), but no 1906 date stamps. And, it certainly looks like it could be a 1906 image/team issued in 1907. Still, its his second earliest image (after the 1905-06 Paul posted) on a pro team, and maybe the earliest of all "card" issuances; all traditional 1907 items are post cards as well. But, perhaps that is the reason for the 10x difference.
Do we know that the 1915 Red Sox PC was issued in 1915? I cant find any with a date stamp.
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