This is a rare horizontal engine from Marvindustries (Robert Fulton Line). I don't think it has a model name of it's own. There is also an electrically heated version
The boiler is heated by an unknown type of burner; probably Sterno fuelled (missing in my example). It fits in a cast mazac base and is of steel construction with an annular seam. It is 2 3/4" diameter x 6" long and has a safety valve, whistle and chimney on the top. It has no steam dome or any form of water level indication.
The engine bracket is mounted directly on the side of the boiler. The double acting oscillating cylinder is approx 1/2" bore x 5/8" stroke, cast in mazac. Steam is fed directly from the boiler, presumably with internal pipes to the top of the boiler. The crank shaft runs in a tube through the boiler. It has a 2 5/8" mazac flywheel on the other end.
As acquired, cosmetic condition was poor. There was some surface rust on the boiler and about half of the original crinkle-finish paint was missing. I have since treated the rust on the boiler and painted it with VHT paint. The top half of the whistle was missing but I have found a replacement whistle. The fibre internal baseplate was warped. I have replaced the warped baseplate with a more substantial stainless steel one. Mechanically it is sound and it runs well.