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Small scratch-built twin cylinder engine - stock code 8024

An interesting small vertical twin engine, apparently scratch-built. Can't quite decide whether we'd describe it as "piston valve", "sleeve valve" or "uniflow" - I'm sure there will be some expert reading who will cast light on its origins.

Turns over freely, missing (we assume) a sump plate or base.
length/inches 3.5
width/inches 2
height/inches 4
weight/kg 0.5