Amp in case is a later incarnation Suprem.
These later amps by Suprem doesn´t hold the quality of the earlier builds,like the Club et al,but are nice amps all said and done all the same.
Suprem was a brand based in Lingfeldten (sp) just south of Stuttgart. I´ve had my head into a number of them and their setup is rather..unminstaken.
The Amateur was their entry amp at the time. Mainstay of their production was EL-34 based amps.
Here an earlier Club Deluxe. A twin EL-34 amp fed by a GZ-34 rectifier. Rather light 112 combo of a mere 14kg.
I guess you can see the similarity. A Suprem Luxor 40.