The Seiko V347A is a modern, solar-powered analog quartz movement featuring a three-hand layout with a date display, designed to offer long-lasting precision and minimal maintenance. A part of Seiko’s advanced V-series of compact solar movements, the V347A powers many mid-size and slim dress watches for both men and women, blending eco-conscious technology with a refined analog aesthetic.

Overview

Built around Seiko’s solar technology platform, the V347A captures light—natural or artificial—through a semi-transparent dial and stores it in a rechargeable capacitor, eliminating the need for disposable batteries. Once fully charged, the movement offers up to 6 months of autonomy, making it a go-to solution for users who prefer effortless, sustainable timekeeping.

The V347A is especially well-suited for elegant timepieces that require a slim profile, accurate performance, and classic styling, including fashion watches, office wear, and casual daily watches.

Key Features

• Solar Charging System: Converts light into energy, stored in a long-life capacitor.

• Three-Hand Analog Display: Hour, minute, and central seconds.

• Date Display: Quickset calendar, typically positioned at the 3 o’clock mark.

• Power Reserve: Up to 6 months on a full charge.

• Hacking Seconds: Second hand stops when crown is pulled to set time.

• Low Power Warning: Second hand moves at 2-second intervals when charge is low.

• Slim Profile: Ideal for watches with refined, lightweight cases.

• No Digital Components: Pure analog quartz performance with clean dial design.

Technical Specifications

• Caliber: Seiko V347A

• Movement Type: Solar Analog Quartz

• Energy Storage: Seiko rechargeable capacitor (not compatible with silver oxide batteries)

• Power Reserve: ~6 months when fully charged

• Accuracy: ±15 seconds/month

• Jewels: 0

• Display Format: Hours, minutes, seconds, date

• Calendar: Quickset date function

• Hand Hole Sizes:

  • Hour: 1.10 mm

  • Minute: 0.65 mm

  • Second: 0.20 mm

• Dimensions:

  • Diameter: Approx. 23.7 mm

  • Thickness: Approx. 3.15 mm

The V347A is larger than ultra-compact calibers like the V33x series but remains slim enough for mid-size dress watch cases (36–42 mm).

Crown Operation

• Position 0 (Fully In): Normal timekeeping mode.

• Position 1 (One Click Out): Quickset date – rotate crown clockwise.

• Position 2 (Two Clicks Out): Time-setting mode – second hand stops for precision alignment.

Important: Avoid adjusting the date between 9:00 PM and 3:00 AM to prevent damaging the calendar gear.

Charging and Light Requirements

• Sunlight (~10,000 lux):

  • Full charge: 10–15 hours

  • One day operation: ~1.5–2 hours

• Fluorescent Indoor Light (~500 lux):

  • Full charge: Several days

  • One day operation: ~10–12 hours

To preserve battery life, allow the watch to receive ambient light regularly. Storage in complete darkness will gradually discharge the capacitor.

Maintenance & Servicing

• Capacitor Replacement: Use only authorized Seiko rechargeable cells. Never install silver oxide or alkaline button cells.

• Resetting: No manual AC reset is needed; the movement auto-initializes after power restoration.

• Gasket and Seal Replacement: Always replace gaskets during servicing and perform water-resistance tests if applicable.

• Hand Installation: Use professional hand-setting tools and check clearances between the hands and dial to avoid friction.

• Dial and Crystal Cleaning: Ensure no dust or fingerprints cover the solar panel area.

Common Issues

• 2-Second Tick: The capacitor is low on energy. Recharge the watch under direct light immediately.

• Watch Stops Completely: May occur after long storage—requires prolonged exposure to strong light to reactivate.

• Short Power Reserve: Caused by insufficient light exposure or an aging capacitor.

• Date Misalignment: Can happen if the date is set during its automatic changeover window—reset outside the restricted hours.

• Hands Skipping or Dragging: Often caused by improper hand alignment or contact; inspect and reset with care.

Applications

The Seiko V347A is ideal for:

• Slim men’s or unisex watches with date function

• Solar-powered fashion or office wear

• Minimalist, low-maintenance dress watches

• Eco-conscious timepieces that avoid battery waste

Its balance of durability, design flexibility, and energy independence makes it one of the most practical movements in its class.

Conclusion

The Seiko V347A is a well-rounded solar quartz movement that supports elegant, date-equipped watches with excellent autonomy and accuracy. With a compact form, easy servicing, and Seiko’s dependable solar technology, the V347A is ideal for watchmakers seeking to deliver refined, sustainable timekeeping in modern analog timepieces. Whether for fashion brands or long-term daily use, this caliber ensures quiet efficiency and long life without sacrificing aesthetic appeal.