Arnold
That boiler is different, looks like some form of a water tube boiler. Looks like you have a unique engine for sure.
My wife also collects toy sewing machines, those little ones that work. She found a Singer from the early 1920's several weeks ago on ebay with some unusual stenciling. Turns out, according to one of the guru collectors in England, he has only seen one other.
Every once in a while we collectors get lucky.
Bob