Reviving this thread.
From my readings on the internet, I believe both MK1 and MK2 dial are used from 6.2m s/n to WG era. We have seen MK2 in 6.x and 7.x s/n, likewise, we have seen MK1 on 6.x and 7.x s/n as well. Possibly Rolex had two dial variations during that period of time.
Another thing I noticed is, there are lesser MK1 dials as compared to MK2 dials.
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