Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 923-0201-975 found under Crystal Unit Quartz by Johnson E F Co. The National Stock Number assigned to this part is 5955000037667, 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 923-0201-975.