Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 177D1 found under Microphone Carbon by Seaview Electric Co. The National Stock Number assigned to this part is 5965006464678, and the Federal Supply Class is 5965 Headsets Handsets Microphones And Speakers. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 177D1.