Ben
I have restored the whole body (including complete new wooden frame) and engine of my 1919 Roadster.
The colour of the cylinder assembly, manifold, waterpomp and generator unit was light grey.
The valve cover, valve push cover and spark plug cover are black.
As I see on the internet all various colours, I wonder if there was an original color ex-works.
I can't find any specification in the documentation.
I live in The Netherlands so it is difficult to find answers overhere.
Hopefully you can help me any further
Peter