Jan, the motor in the bike is WM20, 95045 with RW stamped below the serial number.
I have a spare motor, 100484
The bike with (duplicated) frame number WM20.95045 would have had census number C5128445. It was built under contract number S/1048, a contract for 15.000 bikes (census numbers C5115218 - C5130217). Production of this contract started in June 1943, at 2.000 bikes per month. Which means that number WM20.95045 must have left the factory around December 1943 - January 1944. Here's a picture with a "close" number:
The bike with (duplicated) frame number WM20.100484 would have had census number C5211184. It was built under contract number S/2603, a contract for 8.000 bikes (census numbers C5207518 - C5215517). Production of this contract started in March 1944, at 2.400 bikes per month. Which means that number WM20.100484 must have left the factory around May 1944. Here's a picture with a "close" number:
email (option): wd.register@gmail.com