This isn't going to be helpful, lol, but yes I've seen it for sale on ebay fairly frequently. It sounds like just a variation on granulated soap that is probably indistinguishable, in practice, from any of the other contemporary products.
was started in 1893 by a German immigrant named Michael Werk. It eventually became the Michael Werk & Sons Soap Company. They were known also for a large mansion in Cincinnati.
The link leads to a page about the house that Werks Soap built and a little bit about the Werk soap company.