bgrisso-very good point; I obviously didn't consider that-
A little more info on certification process prior to 1973 (Wiki):
Between 1961 and 1973,
[22] “a chronometer [was] a precision watch, which [was] regulated in several positions and at different temperatures and which had received a certificate [from the (“B.O.)]." Collective certificates, rather than individual certificates, were usually issued. The 1961–73 standard required a mean daily rate in five positions of −1/+10. In 1973, the C.O.S.C. certified a specified daily rate of −4/+6 sec.
In consideration of the today's manufacturing prowess /equipment sets one might wonder why there has been no tightening of the performance requirement.....certainly a good ride for some....
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