Seiko Calibre 3B51A Solar Radio-Controlled Quartz Movement

Restore a compatible watch with the Seiko Calibre 3B51A solar radio-controlled quartz movement, featuring hour, minute, and central seconds hands.

This movement uses electrical energy produced by a compatible solar panel and stored in a rechargeable secondary battery. When assembled with the correct components, it can automatically synchronize the displayed time by receiving Japan’s JJY standard-frequency radio signals. Manual signal reception is also supported.

Additional functions include time-zone adjustment, reception-level and reception-result displays, energy-depletion warning, power-saving modes, and automatic hand-position correction.

Product Specifications

Product Type: Analogue Solar Radio-Controlled Quartz Movement
Manufacturer: Seiko
Calibre: 3B51A
Display: Hour, Minute and Central Seconds
Calendar: No
Radio-Signal Compatibility: Japan JJY Standard-Frequency Signals
Radio Reception: Automatic and Manual
Automatic Reception Times: Approximately 2:00 AM and 4:00 AM
Time-Zone Adjustment: Yes
Quartz Frequency: 32,768 Hz
Accuracy Without Radio Synchronization: ±15 Seconds per Month
Operating Temperature: −10°C to +60°C
Power Source: Rechargeable Secondary Battery
Operating Duration: Approximately 6 Months from a Full Charge
Maximum Duration with Power Saving: Approximately 18 Months
Energy-Depletion Warning: Yes
Power-Saving Function: Yes
Automatic Hand-Position Correction: Yes
Reception-Level Display: Yes
Reception-Result Display: Yes

Radio-controlled time synchronization operates only within supported JJY reception areas and depends on location, signal conditions, building structure, electrical interference, and correct movement assembly.

Please compare the complete calibre marking, dimensions, hand fittings, stem and button positions, antenna configuration, rechargeable battery, solar panel, dial construction, and movement holder with your existing components before ordering. Professional installation is strongly recommended.

Package Contents

1 × Seiko Calibre 3B51A Solar Radio-Controlled Quartz Movement Only

Important: The rechargeable battery, solar panel, winding stem, and all other accessories are not included.

Seiko and its associated marks are trademarks of their respective owner. The name and calibre reference are used solely for accurate product identification.