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More details of the earlier Swiss and Rolex contributions to accurate pre-COSC
testing and examinations revealed observatories at Neuchatel (18661975)
and Geneva (18731967). The Swiss BO's were in existence between 1877 and 1956
for chronometer testing. In 1910 and 1914, Rolex submitted two separate references for testing and both received certificates as meeting accuracy standards as chronometers.
The Swiss 196173 standard required a mean daily rate in 5 positions of -1/+10 sec daily rate. In 1973, the the BO's came under the Swiss C.O.S.C. which specified a daily rate
in various positions of -4/+6 seconds to be certified as chronometers.
Rolex/Tudor probably submit more watch movements for chronometer certification than any other Swiss watch manufacturer. That also most probably means the most chronometers certified world-wide. Something to reflect on.
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