Ran across these just now. Not quite model steam, but pretty cool.
Two Cretors Steam Engines for sale. From what I can find out, these were used to stir the kettles on 1890's-1900's popcorn machines of street vendors. Nice looking. Perhaps someone here would be interested.
https://www.facebook.com/marketplace/item/1533715451376344/
Those are wonderful and very collectible engines. There are some members here that have one or two of these, and most of the rest of us wish we did!