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Seiko 4M21 User Manual

Seiko 4M21
14 pages
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Cal. 4M21
INSTRUCTIONS (P. 8)
GEBRAUCHSANWEISUNGEN (S. 8)
INSTRUCTIONS (P. 28)
ISTRUZIONI (P. 28)
INSTRUCCIONES (P. 48)
INSTRUÇÕES (P. 48)
用法説明 (67 )
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Seiko 4M21 Specifications

Frequency IconFrequency
frequency of crystal oscillator32, 768 Hz
Operating Environment IconOperating Environment
operational temperature range–10° C ~ +60° C
loss/gain (monthly rate)less than 15 seconds at 5° C ~ 35° C
Power IconPower
duration of charge3 to 4 days

Summary

The Automatic Generating System

Oscillating Weight

Component that moves with the wearer's arm to generate energy.

Rotor & Generating Coil Block

Part that spins to produce electricity when the oscillating weight moves it.

Circuit Block

The electronic system that receives and uses generated power.

Capacitor

Device that stores the generated electrical energy for later use.

How to Charge and Start the Watch

Power Reserve Indicator

Full Charge of the Capacitor

Energy Depletion Forewarning Function

Instant-Start Function

Time Setting

Notes for Using the Watch

Preserve Watch Quality

Water Resistance

Explains the watch's ability to withstand water exposure under various conditions.

Temperature Effects

Describes how ambient temperature impacts watch accuracy and performance.

Magnetism and Chemicals

Advisories against strong magnetic fields and chemical contact to prevent damage.

Care, Checks, and Precautions

Recommendations for periodic maintenance, handling, and protective measures.

Specifications

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