Reaction Control System (RCS) thruster as used in the Apollo Service Module and Lunar Module.
Manufactured by The Marquardt Corporation as Model R-4D.
Rated thrust of 100 pounds.
Assembly dated “3Q70” (third quarter of 1970) - at the time of the Apollo moon landings.
(NASA graphic) shows thruster components and materials.
24-pound thruster and the
25-pound thruster (below).
5.17 lbs. (2.33 kg)
Historic Space Systems at www.space1.com