Seiko 6R15 User Manual download pdf (Page 2)

SPECIFICATIONS

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Cal. 6R20/6R21

FEATURES

CHARACTERISTICS OF A MECHANICAL WATCH

1. Thismechanicalwatchoperatesusingpowerobtainedfromamainspring.

2. Whileloss/gainofaquartzwatchisindicatedbyamonthlyorannualrate,accuracyofa 

 mechanicalwatchisnormallyindicatedbyadailyrate(loss/gainperday).

3. Normalusageaccuracyofamechanicalwatchvariesaccordingtoconditionsofuse(time 

 period that the watch is worn on the wrist, temperature environment, hand movement, and 

 windingstateofthemainspring).

4. Whenthewatchisaffectedbystrongmagnetism,ittemporarilygainsorlosestime.Ifthe

 watch encounters a strong magnetic eld, the parts of the watch may be magnetized.  In this

 case,repairssuchasremovalofmagnetismarerequired.

SEIKOAutomaticMechanicalCal.6R20/6R21isdevelopedbyamodulardesigncombining

thebasicmovementoftheCal.6R15andnewlydesignedpowerreserveindicatorandday-

dateindicatorunit.Also,Cal.6R20/6R21isequippedwiththe8beatsbalanceinsteadof

the6beatsoneforCal.6R15.

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Seiko 6R15 User Manual Page 2