Hi Bob
Forget the flywheel for now, it just has the usual generic numbers. I can't actually see any date on your flywheel at all, which as Charles has mentioned puts it outside of anything dateable. Very confusing at times i know
For the record, i have seen flywheel dates stamped on the outside edge of the flywheel too (the part that sometimes get polished or painted over). Might be worth a look there. A magnifying glass helps.
The baseplate however looks as though it fits somewhere into the early 50's. This is what Jeremy and myself have tried to describe as a "rimless" version.
Fairly easy to identify as these baseplates may have only been in production for a shorter period than most others.
These baseplates were fitted to 102's and 40 series motors from (roughly speaking) 50-52. After this the "half round rimmed" baseplate becomes the norm.
Hope this helps
Jon