That is indeed a very nice hot air engine. I was wondering how did you identify it as W. Bischoff? I have never seen it in their catalogs. Thank you for the video. The photo of the second engine appears to have a different maker's plate.
Brent
I also asked myself - because I have the old WBD catalogs. The seller probably told me a fairy tale
- it seems to have been made in Switzerland - that would be great. It is very
precisely made and the frame is all made of brass.
Thanks Arnold