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It's ad cd-13 and a ad-10http://www.fiberglassics.com/wiki/images/b/be/Johnsonservice001.pdf
What is the model number?
Thanks for your help!It looks to me like they had two colors in 1956 holiday bronze and cream I would guess the 5.5 and the 7.5 were the same is the inside of the motor cover the same? Anywhere not exposed to the sun? A little fine steel wool and water will buff off the oxydation.