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Thank you for your observations.   I thought that it could be an engine of some sort too, but there are no inlet or outlet flanges.  The cylinder pivots back and forth as the crank rotates and the extended shaft at the pivot point is hollow and there is what appears a path for steam (or water) to go around the cylinder to the valve gear.  As far as I can determine there is no exhaust port on the engine.

As for as scale, there is no indication it is O scale other than the bolt size.  The nut, bolt, washer casting are consistent with O scale, although bolt size is relative.  There are very few bolts in the cylinder head indication it is a low pressure design.  The output shaft is large at 12 scale inches in diameter in O scale.  

All in all, I have never seen an engine such as this.  It is a beautiful, well made model though and the engines will grace one of my O scale flat cars.

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OGR Publishing, Inc., 1310 Eastside Centre Ct, Ste 6, Mountain Home, AR 72653
800-980-OGRR (6477)
www.ogaugerr.com

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