Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number PREMARIN 0.625MG 1000S found under Estrogens Conjugate by Pfizer Inc. The National Stock Number assigned to this part is 6505005840412, 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 PREMARIN 0.625MG 1000S.