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An ID plate on the engine's throat. It is somewhat corroded, but appears to read

Rocketdyne
A Division of North American Aviation, Inc.
Canoga Park, Calif.
Part Name: Tubular Thrust Chamber
Part No.: 9512-41203-21
Contract No.: 5017
Model No.: YLR-89-NA-7
Stock No.: [blank]
Serial No.: R159R

The part and serial numbers are also stamped on the forward end of the thrust chamber.