If you're looking for an actual birth year watch, keep in mind that the date code of -78 in the reference number doesn't actually reflect it's year of manufacture. Typically the reference started production around that year, but continued with the same reference all the way through the 80's. The one you posted was probably made in 1981 according to
I Love My Speedmaster.
beyond that it looks correct to me, but a rather chewed up case. The movement however looks in good shape, and the price isn't horrible.
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