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The engine's "master" ID plate. It reads

Rocket Engine
Part Name: Rocket Engine Assembly
Contract No.: NAS8-251256
Part No.: 104001
Spec No.: R-1420eS
Stock No.: F-1
Serial No.: F-6045-1
Model No.: [blank]
Accepted: [blank]
Weight: [blank]
Insp: [some sort of inspection stamp]

Below the "master" ID plate are two MD RD171-1052 identification plates.

This photo has been rotated 90 degrees counter-clockwise for readability.