Nah, that's long gone. Probably removed when it was repainted in 1990.
Eh. It'll just be one of the mysteries of my truck, I guess. Right up there with the dent in the roof of the cab... which is a mystery given that the dent is pushed -into- the cab, like someone hit it from the outside, but there's no dent whatsoever on the outside!
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Project 1970 - soon to be seen at
http://milhouse.treylis.org:81/