i found reference to a bifacial token 'Y' in a token listing i have. below is what i found
business location San Francisco, Ca
maker of token Wirth & Jachens may be able to add Irvine to the makers name.
I searched Irvine Wirth & Jachens. found reference to them making police badges and saloon tokens. one site gave their address 2129 Market, San Fran., Ca
Here is a link to other items made by Irvine Wirth & Jachens
http://policeguide.com/Photo_Galleries/...Badges/san_francisco_police_badges.html
other links while searching "wirth & Jachens" suggested they made saloon tokens as well
the above information gives credit to Kappens California Book.
i do not have Kappens book. But this is a good place to start.
mike