Reasonable Expectation of Accuracy from a Watch

Reasonable Expectation of Accuracy from a Watch

Reasonable Accuracy Expectations by
Watch Type**		 Worst 
             Typical
                   Best 
            Best
            Accuracy
Modern quartz watch chronometer  
certified (rare movement)  		+ / -0.02
            + / -0.02
            + / -0.0
                  99.9999%
Modern mechanical watch non-certified
+ / -10
      + / -5
      + / -2
            99.9942%
Modern mechanical watch chronometer
certified		+6 / -4
      + / -3
      + / -1
            99.9977%
Modern quartz watch  non-certified 
(normal movement)		+ / -2
      + / -1
      + / -0.1
            99.9998%
Vintage mechanical watch in good repair 
+ / -60
      + / -15
      + / -5
            99.9826%

 

*Seconds gain / lose per day

**For reference purpose only & result may differ among brands

 


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