@hoipolloi The situation with onyx markers is interesting but I think it's more fluid and depends on targeted markets than cut and dry like that. I've got a 561 in 24.3mil and a 551 also in 24.3mil, and both still have onyx markers, while other 564s in 25mil have painted markers. But in other references like 168.024 and 168.025 that only have cal. 564, many of them still have onyx markers, and they are in 26-28mil range. Unless there is an authoritative source, I think it is at best a guess as to when they stopped putting onyx on the dials.
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