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The engine's ID plate, located on the engine's throat.

I was very pleased to see that the restoration crew had gone through the trouble of preserving the ID plate, which is too often painted over or simply subjected to treatment which causes it to become completely unreadable.

The ID plate reads

Rocketdyne

A Division of North American Aviation
Canoga Park Calif.

Liquid Rocket Engine

Part Name: Engine Assy - Sustainer
Contract No.: 8435
Part No.: 100616
Spec No.: [blank]
Stock No.: [blank]
Serial No.: 2224A
Model No.: S4
Accepted: [blank]
Weight: [blank]