This is a very large size model solenoid engine. It is very intricate and very well machined. The photos show the great detail that went into the building of this engine. I have no way to test it but everything fits precisely and turns very, very smoothly. I’ll leave it up to a model engine collector to figure out what the power source should be. Engine measures 9 1/2″ overall, 4 3/4″ wide, and 4 1/2 tall. The flywheels are 4 in diameter. (Cola can is not included). The item “Vintage Large Solenoid Model Electric Motor / Engine not Hit Miss” is in sale since Tuesday, September 29, 2015. This item is in the category “Toys & Hobbies\Electronic, Battery & Wind-Up\Battery Operated\Pre-1970″. The seller is “elcajonian” and is located in El Cajon, California. This item can be shipped to United States.