6730-00-953-2251 (638-50)
NSN 6730-00-953-2251 (NIIN 00-953-2251) is a photographic mask in Federal Supply Class 6730, Photographic Projection Equipment. Manufacturer part number 638-50 (Buhl Optical Co, CAGE 09624).
NIIN assigned January 1963; DEMIL A (none required); unit of issue EA (each), $14.36 gov standard price.