I am caught flat-footed, out of town, without my Speedmaster, and stuck on a wretched IPad, but think my watch's serial number is not far from this watch's serial number. Seems like my watch dates to 1985.
I'm of the opinion that the dial is a more recent service dial. "Swiss Made without the characteristic bracketing "T's" may be an indicator of the later service dial. It may only be the photograph, but the case appears to have had a polish.
Someone will be along with more knowledge and perhaps a reference at hand or even a Speedmaster of similar age.
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