Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 12C891-1 found under Headset Microphone by Oai Electronicsllc. The National Stock Number assigned to this part is 5965012752212, 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 12C891-1.