It's a known fact that in the 1950's,japanese companies would buy all sorts of Bikes, DKW, Norton,BSA etc, etc, They would tear them apart and re-engineer them.
If you took a 1950's DKW with a Pressed Steel Frame and painted it that Honda Red they were using at that time, one would assume it was a Honda Dream at 1st glance!
They got rid of the Oil leaks and the need for constant bolt tightening,along with electric start.
The Royal Enfield was called the 'Royal Oilfield'!