also if you do a search using the words
bernsteinfarben lasiertes becher
(and you can replace 'becher' with pokal or stangenglas or Fußbecher )
you should come up with a number of amber cased over clear pieces that might help.
It's difficult to find a match. And difficult to date depending on the details of the engraving, the subject, wear, the type of overlay, the type of foot and base etc

I've not been able to find any information on coloured pieces related to Anton Kothgasser though having just spent three days researching my own pieces. (If anyone has anything to add on this I'm very interested).
I believe Egermann invented this yellow stained glass (open to correction and can't find a reference source for that right now), but Harrach also used it. I couldn't see any pieces in the Harrach book with that shape and casing though.
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