Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 337-00001 found under Indicator Vertical Velocity by Barfield Inc. The National Stock Number assigned to this part is 6610015455199, and the Federal Supply Class is 6610 Flight Instruments. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 337-00001.