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Detail of the engine's ID plate (visible on the outrigger just to the right of the valve package). It reads

Apollo Test Capsule

Bell Aerosystems
A Textron Company

Thrust Chamber
Stock No.: <blank>
Part No.: 8258-470385-9
Contr No.: NAS 9-1100
Serial No.: H37-385-13

Bell Aerosystems originally had the contract to produce the entire Ascent Propulsion System engine, but encountered difficulties with combustion instability. In July 1967, NASA awarded Rocketdyne a contract to provide a stable backup injector system, engine qualification, and engine final assembly. Bell continued to provide the thrust chamber for the engine.