Hi-
I have the same ad. It is from the September 25th 1913 issue of Life Magazine, page 539. Mine is part of the complete issue (I'd love to display it separately but I hate destroying anything old). I do not know if this ad appeared in other places. I also do not know anything about the sweaters or the company. If the paper is consistent with early 20th century magazine paper I would assume yours is an original.
Alan
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