Nearly every image used for both the T205 set and Helmar stamps (there may be a handful of exceptions), was shot by Paul Thompson’s news photo service in 1910. They made a concerted effort to shoot a portrait of every player in the league that season (see 1911 Spalding Guide), then from 1911-13 they predominantly shot only the rookies and players who changed teams. You’ll find 1911 images among the Helmar stamps that don’t appear in the T205 set. Here’s a bunch:
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