Hi Ivo,
thought I have to register at the message board, since my homepage got quoted here already several times. I´m glad it could help a little yet, even so it will take some more time, until I put up a whole translation.
Nice bowl you have here. Maybe Dirk ist right. This sort of bowls were actually produced by Hesse Glassworks with solid colours "Rauchgrau/smoke", "Flieder", "Neurot" etc. and also with cased colours (violett seems to be the favorite colour now and in the early 60s).
Maybe I can find out, if you send us the size of the bowl.
For future-topics: don´t hesitate to send me a message, if you have any questions about Hessenglas or Kristallglas GmbH in Oberursel. I´ll try to help.
btw. "Neurot" was the "very official" Hessenglas name for this magnificent colour. But I like "citrinvirgin" as well!

Greetings from Hessen,
Oliver
www.kristallglas-oberursel.net