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Detail of the engine's interface panel, on the forward end of the F-1 engine.

Picture 4 of 4.

View of the identification plate to the upper left of the LOX inlet closure.

It reads

Part No.: 410410-11 Assy.
Part Name: Panel Assembly, Interface - Engine
Serial No.: 2020701      02602
Stock No.: F-1

How fun is that! A stock number of simply "F-1!"