It was a long time ago, that's for sure.
The phone number Vester 127 tells a little in that it refers to the manual central "Vester" for the West
part of the bridge quarters of Copenhagen.
Some parts of Copenhagen were among the first parts of Denmark to be automated, other parts were the last.
Vester was a demi- (= half-) automatic central which meant that clients would dial the first two digits (here:"VE") and then
you told the nice lady the number 127 and she would put you through.
You only needed to dial "VE" if you were not in the same area as that particular central.
The first demi-automatic central came in 1927 and the last one was taken down as late as 1978.
This shop had both a Vester number and a (higher) Central number, suggesting that we are not very early
within this period.
From the type of label, the fonts used etc. I would say around 1950.
Look inside and see if there are any other indications. It was not uncommon for the serviceman to put dates
on valves and other essential components when they were replaced.
Where that radio repairshop was, is now a scooter repairshop.
http://maps.google.dk/maps?q=stenosgade+5&hl=da&um=1&ie=UTF-8&hq=&hnear=Stenosgade+5,+1616+K%C3%B8benhavn&gl=dk&ei=JaG9TePxC4mDOp3EzYEG&sa=X&oi=geocode_result&ct=title&resnum=1&ved=0CA0Q8gEwAA
Martin