That's a real beast.
No idea about the maker. The layout reminds (faintly) of a French Radiguet, but my gut feeling says that this is a very professionally made "home built" engine.
Hallo Thomas - thanks for your replay - I am now pretty sure that it is a French Radiguet
I have checked the website of Historytoy - and the engines are exactly the same...
As soon as I can get it - I will know more
Greetings over the lake, Arnold
https://historytoy.com/spielzeug-Dampfspielzeug-Stehende-Dampfmaschinen-Radiguet-Massiot