This is cool. The German economy was certainly dependent on foreign cash, and Leica and Zeiss manufactured 'consumer goods' to the last day of the war, which went straight to Sweden. In the early days of the war, the British government asked Contax and Leica owners to donate the cameras to the war effort.

Here is a partially confirming URL:

http://www.nelmes.fsnet.co.uk/paxman/blockade.htm

I somehow envision Ole out there, beachcombing for old Leicas, washed ashore in the Skagerrak...