I believe that Cromas are made in Eisfeld, Thueringen, in what used to be East Germany. The plant made Triton R3s in the old German Democratic Republic days, and now Cromas, and has apparently been purchased by Harry's for their nefarious purposes...
Croma, Elios, Bolzano... all from the same factory in Gemany owned by Feintechnik https://www.feintechnik.com/
They're not great IMO. Never heard of the Goldendeer ones.