ISO 10553:2003 Preview
Horology -- Procedure for evaluating the accuracy of quartz watches
This standard was last reviewed and confirmed in 2014. Therefore this version remains current.
ISO 10553:2003 specifies the procedure for evaluating the accuracy of quartz watches, individually and by lot, and the relationship between the accuracy tested and the accuracy classification given by the manufacturer.
It applies to quartz watches having accompanying documents on which the accuracy classification is indicated.