Who know this glas: Jenatherm Sx Glas

I bought Primus 1020. The marking is "Jenatherm Sx Glas.
I tried to find this glass brand but could not see.

Someone know this glass, pls share some information (history, who is owner...)

Thanks,
Minh

 

THe only thing i know:
"Jenatherm" ist a trade-mark from the former "German Democratic Republic" ("GDR", "East Germany").
Afaik another mark produced there was "Rasotherm".
Regards - Steven

 

On this page (scroll down) is some visual information about the marks:
https://www.hasag.info/hasag/logo.html

 

Glasses with this marking turn up on Primus lamps from the late 1940s. It doesn't appear to have been used for that long.

 

Thank @Steven67 Thank @Nils Stephenson