Hi Mark, hope you are feeling better every day!
Yes the finish on my byf 42 P.38 is the dull blue type. I don't know why they changed the finish, but I like the 1942 finish better too!!
The Luger is about 10,000 from the end of production. Only the L-Block and the first few M-Block have higher numbers. That is, of course, for the German Military Contracts. The rest of the M and N-Blocks went to Portugal and Bulgaria.
Cheers!