Best I can do so far, I found a couple of pics of 109E's that start with "BY + ?? & RL + ??". I know some of the early Bf 109's had "D-xxxx", not really sure how that worked.
I found this on the Preserved Axis Aircraft, not sure how accurate it is,
http://www.preservedaxisaircraft.com/
Bf 109E-3 Wnr. 790 ( a few numbers off from 820 ) AJ+YM, used in Condor Legion, now in Duetsches Museum Munich.
I found these pics in "The Luftwaffe In Sweden 1939-1945, Bo Widfeldt.
Regards,
Mike