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Horizontal twin mill engine on brass supports with hardwood base - stock code 7625

A scratch-built twin cylinder mill engine, gunmetal cylinders with slide valves actuated by eccentric, balanced crank, the whole thing mounted on a brass bed plate, itself on a wooden base. Fit and finish is excellent throughout, it runs absolutely beautifully on air, down to a slow tickover.

length/inches 18
width/inches 12
height/inches 9
bore x stroke/inches 1 (est) x 1 3/4