Unknown engine; who, what, where, when and why

Hello, I just recently picked up some steam engines. There was an incomplete Mason/Locomobile with a bronze frame, two rough and incomplete Stanley EXs and this unknown engine. What can you tell me about this engine? Manufacturer?? Well I thought if there was another of these engines out there than it should be easy to identify as the engine manifolding has a pivoting bracket. Probably to mount the engine and for tensioning the chain. I drove over to visit a Stanley friend who shares my same first name. He thought the lower part of the engine was newer than the rest of the engine. Thanks everyone.

No idea? Any chance the ex engines ar for-sale I need some parts.