Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 10306 found under Gearcase Motor by Waltham Clock Co Inc. The National Stock Number assigned to this part is 3010010790527, and the Federal Supply Class is 3010 Torque Converters And Speed Changers. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 10306.