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Before COSC certification, watches were submitted to Swiss "Bureaux Oficiales" BO's
for testing. Hodinkee did an extensive article written by Eric Wind on the KEW observatory 44-day in depth testing procedure.
About 100 were submitted by Rolex for KEW certification and those received a certificate.
They also became quite valuable as collector's interest peaked over rare watches that were extremely accurate.
Originally, the KEW (UK) standard testing was for the British Navy chronometers, requiring accuracy under stringent conditions.
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