Once again, thanks to the help of friend Herbert Fischer, we've made another discovery. There was a company that Josef worked with in Vienna called Argentor. They sold goods made of silver, bronze and gold.
I had located a copy of their catalog from the 1930's but was having difficulty getting a response from the seller. Herbert purchased it on my behalf and sent me photos of the pages. Among are offered small reproductions of several pieces I own, smaller versions of a few pieces I've known about, and then some pieces I did not know of. It was a wonderful find. For example, here is a cut from the page showing one of two pieces Josef called "The Kiss" (both masters are in my apartment).