That's pretty f*cking cool! How much did it cost? (I'm fine with DKK here)
According to this from the Danish tax agency, a regular set of number plates costs 1180 DKK (in addition to the registration fee, which depends on the car). Historical accurate number plates cost 2480 DKK. The site also state, that regular plates can be bought from any registered number plate operator, whereas historical accurate number plates must be obtained from the agency's offices (of which there are 3 in the whole country).
They warn that they take 8 weeks to make, but it took 6 weeks for mine.
Edit: If you are interested, they also list the historical designs for the number plates here. Yes, any of these designs are available to you, if your car was first registered in their period.
I love it, and I have to say that Copenhagen is my favourite European city. So clean and beautiful, and also Christiania
Actually, the picture was taken at DTU (Denmark's Technical University), near Kongens Lyngby, which is just outside Copenhagen (although considered part of the Greater Copenhagen area).
It isn't much fun driving around Copenhagen I'm afraid. Maybe when it really becomes summer.