CK2015 is 35mm
Other Omegas from this era can be as small as 29mm up to the biggest i have seen 44mm (but these are very rare and often sell in this big auctions for $5-10,000 plus). The CK859 is 37.5mm or 38mm if I recall and this too is an expensive but beautiful rare piece. The majority though I would say are under 35mm at around the 29-32mm range.
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