Douglas identification help needed

Can anyone help identify my Douglas engine. It is a single cylinder vertical side valve engine with a stroke of 3 ins and a bore of 2.5 ins, giving an approximate capacity of 250cc. This does not seem to relate to the SV range produced in the late 40s &50s, so can anyone offer any ideas as to its age or any other info (did it come off a generating set?) TIA

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THE DOUGLAS STATIONARY ENGINE RESOURCE (admin)
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