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Any Information on This Gas Engine?

OS Kelly Western Gas Engine  

Here are some pictures of a gas engine that I need help getting info on. All it has cast into it is: OS Kelly Western, Iowa City, IA. No ID or serial plate found. It is yellow with black pinstripes. It is coil-fired with no mag. Can anyone help me?

Larry Helwig, 3912 Schneekloth Rd., Bellevue, NE 68123