I would greatly appreciate it if you would look up ours: WM20 39662, C4356254. I think we are in the same boat as Hans, the bike was brought over from the Middle East many moons ago.
These key cards are very incomplete I am afraid unlike the BSA factory ledgers. We have nearly all bikes up to WM20 69699, here your bike.
Henk
The Keycards themselves are not imcomplete, exept the YE series, but it's just that only a fraction of the produced bikes survived the war, and were used in the postwar army. I'm sure Henk meant something like this, but just had to clarify.
The ledgers go upto contract C12424 1941 and after that nothing more! maybe someday the rest will be found??