Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number SM-D-850202-1 found under Case Optical Instrument by Weckworth Manufacturing Inc. The National Stock Number assigned to this part is 1240010438432, and the Federal Supply Class is . Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like SM-D-850202-1.