Please allow me to introduce my recently acquired turbine here. Needless to say I was very happy to get it -for a very good (=low) price, btw.
Still, I have not been able to establish the maker with certainty. I would say a classic German one, I tend to believe Bing at the moment (unless it were a very well done BITSA fake!?) - but although I have searched the net and presented it in another forum, as yet no other example has shown up of the whistle, the boiler house or the turbine itself. The chimney is quite obviously not original. Another example of the distinctive water gauge cover is being offered as a spare part on German ebay at the moment and that as "early Doll", but I have my doubts, as I have not seen this cover on a Doll engine so far. So please, in case you can show me similar items or supply any other kind of evidence or expertise - you are most welcome!
Here some photos:
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The letters at the turbine base are "DRGM" = "Deutsches Reich Gebrauchsmuster" German Reich protected design, so definitely pre WWII.
If you need more details or measurements, just let me know