MS51913D, MILITARY STANDARD: SEAL, PLAIN ENCASED, DUAL SEAL, EXTERNAL SEAL SPRING LOADED (27 OCT 1986) [SUPERSEDED BY A-A-52524/9].
MS51913D, MILITARY STANDARD: SEAL, PLAIN ENCASED, DUAL SEAL, EXTERNAL SEAL SPRING LOADED (27 OCT 1986) [SUPERSEDED BY A-A-52524/9].