Since Malt is not yet chiming in, I can answer a few questions...
Vingtor was an electronics co. founded in Norway in 1946, mainly producing radios and amplifiers. There were several models, ,the early ones typically 5-10 W combo, or suitcase models, where you lifted the amp out of the suitcase, which then became the speaker cab.
My father was an accordeon freak, and off and on ( mostly on)had his own trio ( sometimes a quartet) from the early 50s until he retired in 1990. Even after that, the same old trio used to perform at retired citizen events, ever still popular. One of the guitarists had one of these suitcase models, which I've been loking for strictly for nostalgic reasons.
The company later turned into ultrasonic equipment and later being swallowed and reformed turned into Vingmed, a co. specializing in medical electronics with an international merit. Now mostly owned by GE, I think....
If you google " Vingtor forsterker" ( norw. for amplifier) you might find some more piccies, but there's not a lot of them.......
EDIT: Seems like Malt was writing simultanseously... now you got the details both of the amp and the company......