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The sign near the F-1 engine.

It reads

F-1 Engine

A cluster of five engines like this one provided the power for the first stage of the Saturn V launch vehicle during all Apollo manned flights to the moon and the launch of the Skylab orbiting laboratory into Earth orbit.

These engines burned for 2½ minutes, lifting the Saturn V to a height of about 36 miles and a speed of about 6,000 miles-per-hour. Each F-1 engine developed a thrust of 1,500,000 pounds. Each engine weighs 15,650 pounds and uses propellants of RP-1 kerosene and liquid oxygen.

The more commonly-used weight for the engine (including nozzle extension) is about 18,600 pounds. The weight of the nozzle extension alone is only about 1,600 pounds, so I'm uncertain as to where the 15,650 pound figure originated.