Just wanted to add my Norwegian 45 to this post. I am also looking at another one that is Nazi marked and has been in the owner's collection since the 1960's. He got it from Hunter's Lodge.
I have a copy of your book on the 1914 Kongsberg Colten. I own one of the 1942 made guns and I noticed that the hammer is not serial numbered but it has
the wide checkering and an "S" on the left hand side. 26641 is the SN of my gun.
Also, there is no serial number on the barrel bushing and the magazine release.
Can you comment on the parts that were not serial numbered on the later guns (1941-1945) as opposed to the earlier guns from 1914 to about 1929.
My best regards
In the late 1920s, the procedure for numbering individual parts of the pistol was changed.
Some of the small parts were no longer to be numbered.
After 1933, the hammers were not to be numbered.
So it is correct that the parts you mention should not be numbered if your pistol is from 1942.
The marking "S", I have not seen before.
Karl E Hanevik
NORWEGIAN 45 AUTO PISTOL
Serial #26641 shipped Feb. 2nd, 1942 in a group of 150 pistols numbered from 26605-26754 to AOK Norwegen (Armeeoberkommando Norwegen) which was the German Army unit operating in northern Norway at that time.