I got this engine from a friend here in Australia.He got it some years ago at a swap meet with no history.It seems to factory made. It is a single cylinder oscillating design of all cast bronze.it has a small all silver soldered boiler suspended inside the outer shell held only by the filler plug and the safety valve,there is a air gap all around the boiler and the exhaust vents through the stack. It is spirit fired and runs very well.