Hiya Dirk, The picture of the vase you sent me sure looks like a very similar matching piece to this bowl even the inner pattern looks very much like this bowls, but would this galvanic process allow the maker to cap the rim in silver like this bowl or was it only possible to galvanise a flat surface. I must just say also the silver on this bowl looks and feels more than a 1000th overlay in thickness. Also this galvanised technique was used by many over the years, but had to be abandoned due to the health issus involved in the use of such dangerous chemical elements such as borax, oxide of lead and the very lethal white arsenic which were all used to complete the process of enabaling the silver to bind and hold on to the glass surface.
Also looking at the shape and overall design of this bowl compared with your vase, would you say the bowls design was Germanic, personally I would'nt. Like I mentioned in my first post when I first saw this bowl I imagined it to be nearer a eastern block or Russian creation rather than anything else, but as Ohio pointed out it could well be an American piece. There are no marking whatsoever, did Carl Spahr or Jean Beck sign or mark their wares?