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.