there is no particular " rule " about fading to brown : there are 3 mains " degrees " of faded mk2 dials ( chocolate , middle and dark brown ) but you can find the 3 shades in all batches of " 1665 mk2 " produced so in the range from 1.7 up to around 3.1 ( many US collector on the contrarry accept mk2 dials up to 3.5 ).
in my opinion most mk2 ( if not all ) were produced roughly at the same time ( 1967-8 ) and then fixed to watches when new cases were avalaible.
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