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My attempt to photograph two ID plates. The Smithsonian no longer allows monopods for photography, and the engine is behind guard rails, so none of the text is discernible, even in the full-resolution version of this photo.

I did not notice this at the time, but toward the left (behind the circular fitting ringed with bolts) can be seen the white stencilled digits "2046". Rocketdyne used a different serial number scheme for its F-1 engines than did NASA,although only the first digit of the serial numbers differed; in this case, a Rocketdyne serial number of "2046" corresponds to a NASA serial number of "6046". In all cases, it is the NASA serial number which appears on the engines "master" ID plate.