A simple regulation is all that's needed.
COSC specs are -4/+6, so it's really only 1 second off 
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Day Date 18238, Yachtmaster 16622, Deepsea 116660, Submariner 116619, SkyD 326935, DJ 178271, DJ 69158, Yachtmaster 169622, GMT 116713LN, GMT 126711.
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