Northrop Grumman Sperry Marine C. Plath 74560 4590-AS Rev. AA Navigat X Gyrocompass w/ Sphere, Used-Interconnection Cable SR 180/185 Used For Pictures Only And Is Not Included-Missing Small Belt For Top Gear Drive-Dimmer Knob Works But Is Loose-Overall Appears To Be In Great Condition Other Than The Missing Belt And Dimmer Knob But Not Fully Tested So Listed For Parts/Repairs or Not Working-See Pictures