It's about the same era fossil as the Lister looks.
I found it last year at about the '1975 layer' in the gulley full of old stuff. The bottom was buried and the top was exposed to the elements for quite a while. The sprocket pitch and width matches a Dussleforf Triumph motorcyle engine mounted in a frame with the remains of an electric start and a throttle on it. There's a sprocket countershaft with a slack belt run to a starter mount and an old floorboard button starters on the frame......all the evidence points to this genhead being hooked up by roller chain to a motorcyle engine of about 250 CC and run by throttle instead of governor.
There are remains of three more hydro-power schemes on the creek, any of which this genhead could be a part. One of the old timers said there was another "tremendous" genhead that came from a hydro-power plant somewhere but he said that one could have been used, ".... to dam the creek up but not generate any power from it!". I'd imagine that one got sold for scrap at one time or another.
Several old timers have mentioned two generators running from an overshot waterwheel by Vee belts. They said those genheads were war surplus bomber units of 26VDC and the "belt would squeal when somebody turned on too many lights." (Sodium Penethol would probably get the same story because it's old enough to have *become* true.) A flood in the mid '50s got that outfit.
I've also found scraps of lightning scattered 'welding cable' that went up to a wind turbine in the early '60s.