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ROLEXROLEXROLEXROLEXROLEXROLEX
ROLEXROLEXROLEXROLEXROLEXROLEX
9 January 2010, 02:23 PM
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#3 |
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TRF Moderator & 2024 SubLV41 Patron
Join Date: May 2007
Real Name: Larry
Location: Mojave Desert
Watch: GMT's
Posts: 43,514
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COSC did not exist until after 1973. What COSC did was standardize the Swiss standard at -4 to +6 seconds per day (roughly... it really is more complicated than that)..
So, any watch after 1973 that has Chronometer on the dial had to have met those standards and been tested.. From ~1960 until COSC Standards in 1973, the "chronometer" standard was -1/+10
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