Saturn Rocket Auxiliary Propulsion System (APS) Quadruple Check Module, measuring 2.75″ x 4″ x 2.25″, with a NASA George C. Marshall Space Flight Center tag on the side, reading: "Module, Check, Quadruple, APS, Assy NO. A-63077-503, Dac. Spec. 1A67912-503, FSN G, Contr. No. NAS7-101T, Ser. No. 1140, Date 12-67." In fine condition.
