I've seen this pattern before (also in amber) and although it reminds me of Stölzle, I'm not convinced it is. There's a pattern with a similar shaped tray with a patterned base, on Pamela's site:
http://pressglas-pavillon.de/toilettenservice/07024.html which I've seen attributed to Reich (although Pamela doesn't state this as the case), so my gut feeling (and that's all it is at this stage) is this is yet another Czech glassworks.
I can't imagine that one glassmaker would make two patterns so similar, and as we probably have two glassworks with similar styling, it's not beyond the ken for there to be a third. It was clearly a popular design of the time.
I've scoured the catalogues I have access to for it without success, but we do know there are still loads of catalogues and even glassworks we've not yet pinned down patterns for. One day it'll appear, with luck!
I'd be unhappy with an attribution to any maker at this stage.