Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 658320-001 found under Oscillator Noncryst by Watkins Johnson Co. The National Stock Number assigned to this part is 5955012777783, and the Federal Supply Class is 5955 Oscillators And Piezoelectric Crystals. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 658320-001.