amazing case and amazing dial! as you already pointed out service hands-set and slightly later crown (the correct one has still the same star but it is slightly bigger and especially the circle that is aroud the star is slightly larger). Your crown is the same as the one of the example sold by Phillips, also not 100% correct, but still much better IMHO than the later 70's service crowns with the inverted star.
You did not post pics of the caseback but it should have a star engraved on it, being a MKIII.
Overall a great piece, wear it in good health!
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