seems to be a bridge between RPM and lawnboy
This machine was bought used by my father from a co-worker in the late 1950's. It was used extensively though the late 80's and has only been run sporadically since then. A restoration is planned, pending verification of make and year of model. There are no markings, other than the model number (8SH10), safety markings (e.g. "place foot here") and the name "iron horse" on top the engine's flywheel.
1950 seems to be a bridge between RPM and lawnboy 8SH10 (red deck)