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Overall view of the forward end of the 1/4 F-1 engine. There are a number of items to note:

• The engine lacks an interface panel, a gimbal bearing, a turbopump and heat exchanger, and propellant high-pressure ducts.
• There are two ID plates on the exterior of the combustion chamber.
• This represents the center engine (which was not designed to gimbal), so its gimbal outriggers attach to fixed struts.
• This is a later engine, as indicated by the presence of studs and nutplates used to mount the engine's thermal insulation on the outer surface of the engine.