For those who might be interested, I have info on the serial / frame number..
This is based on the danish numbering system for bikes.
"W" indicates it's imported.
"AK" indicates Aage Krĝll as the importer.
The numbers, i guess, is just the "running" number of the frame. (Directly translated from danish term. Don't know if it's called the same in english, but i think you get the point.)
"X" is the production year, with 3 options: 1962, 1983, 2004.
So i will put my money on 1962.
Not much have happened to it since the pictures posted, except new pedals, another dropbar, saddle and a front brake.
Still looking for / acquiring goodies for the final build.
Cheers.