I really don't know but I suspect the seller may be right in that it is
probably one of the hundreds(?) of un-branded casting kits sold at that time
for people to build themselves.
Most of which, in my experience, look to have been assembled with a knife and
and scant knowledge of the principals of the infernal combustion engine. Back
these things were contemporary, I bet only a small proportion of them ever ran as
their designers intended.......
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