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Which is more rare: white or black dial
Thanks for sharing!
Regarding which is more rare, as you mention in your review, black or white versions, feel free to check out my serial number project for the Mido 5907 at my Alpha Hands site (http://alphahands.com/vintage-watch-research/mido-powerwind-ref-5907-deep-dive-timer/). I keep it as up-to-date as possible with all of the Mido 5907s seen to date.