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CMG horizontal cam-operated engine - stock code 4030

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CMG horizontal cam-operated engine
CMG horizontal cam-operated engine
CMG horizontal cam-operated engine
CMG horizontal cam-operated engine
CMG horizontal cam-operated engine

I could use some help on this one, not at all sure what it is.

At first glance it looks for all the world like a Stuart Score, until you realise that there is only one cylinder, flanked on either side by a pair of piston valves, each spring loaded and cam-operated from the crank. The cylinder is single acting, steam looks like it’s supposed to go in one side and exit opposite.

The thing is nicely made and turns over freely – I’ve never seen one before, I’m sure somebody will let us know what it is.

Flywheels 3 inch diameter

Base 6 x 3 ½ inches