Autoprop model AP 2183RH feathering propeller. Right hand rotation 19.5 inch diameter 1.5 inch standard taper shaft. According to Autoprop, this is an H6–496 BB system, originally specified for a Celestial 50 sailboat. We used this propeller briefly with our 68 foot IOR sailboat and a Yanmar 100 hp engine before removing it when we sold the boat. it could use polish but is in very good mechanical condition with smooth bearing operation.