Some of these pre-date WWI. One of the more commonly seen swastika tokens shows a boy scout on horseback, and it's dated 1910. It advertised Excelsior Shoes as I recall.
Generally, higher grade swastika tokens can fetch $20 or more. I'd venture that the lower grade subject token has a base worth of $10 or so. A collector seeking tokens from his home area would probably value it higher. Also, the subject matter or occupation, could enhance the token's value in the eyes of some. Many collectors erringly shun this series, given a historical "disconnect" with the swastika symbol. I believe I once read that this symbol was originally used by the Egyptians to illustrate the power of the sun.
I seem to recall that there was a book published on these within the past ten years or so. If so, I doubt that it would be near an all-inclusive work. This series is a relative exonumia frontier that has yet to gain serious attention.