Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 6645-01-491-9805 found under Clock Wall by The Chicago Lighthouse For People. The National Stock Number assigned to this part is 6645014919805, and the Federal Supply Class is . Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 6645-01-491-9805.