I've just noticed a not dissimilar (though maybe not quite as pronounced) AML on my -68 (crappy phone pic in artificial light):
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from wrist shot in sunlight
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Compared to -64:
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Sniffing around online, it seems that Professional dials do show up with the same kind of appearance - slightly pinched looking, meaning the feet aren't quite level. I've not seen photos of a pre-Professional dial with the same behaviour, though - is it possible the original dial here was an early service item, maybe produced in the late 1960s?
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