Seiko 2626A – Technical Guide (High Quality)

The Seiko 2626A is a compact quartz analog movement featuring a three-hand display with day and date complications, developed in the early 1980s as part of the Seiko 26xx quartz movement family. Designed for ladies' watches, the 2626A brings together precision quartz performance, a bilingual calendar, and a slim form factor, making it ideal for everyday dress watches in small cases.

1. Technical Specifications

2. Key Features

• Three-hand display: Hour, minute, and central seconds

• Dual calendar: Day and date at 3 o’clock

• Day wheel bilingual (e.g., English/Spanish or English/Kanji)

• Quickset date via crown pull

• Day changes by rotating the hands past midnight

• Hacking seconds for precise time synchronization

• Compact and thin – ideal for ladies' watches with limited case space

• Efficient power consumption with long battery life

3. Calendar Operation

Setting Instructions:

• Crown Position 0 (pushed in): Normal timekeeping

• Crown Position 1 (first click):

  • Turn crown clockwise to quickset the date

  • The day does not quickset (advance manually via hand cycling)

• Crown Position 2 (pulled out):

  • Set time (all hands move)

  • Seconds hand stops (hacking) to enable precise setting

⚠️ Avoid using the date quickset function between 9:00 PM and 2:00 AM, as the calendar mechanism may be engaged, risking damage.

4. Movement Architecture

Front Side (Dial Side):

• Day wheel with bilingual display

• Date wheel with jumper spring

• Driving gear for date

• Cannon pinion and hour wheel

• Calendar bridge and quickset components

Rear Side (Circuit Side):

• Quartz crystal oscillator (32,768 Hz)

• Integrated Circuit (IC) with pulse division and motor control

• Step motor and rotor

• Gear train for hands

• Battery cell holder and contact springs

The calendar system is compactly integrated without compromising movement height.

5. Battery and Power

Battery Change Procedure:

1. Open the case back using a case knife or wrench.

2. Use plastic tweezers to remove the old battery.

3. Clean battery contacts if needed.

4. Insert a new battery with the positive (+) side up.

5. Check that the second hand resumes ticking within 10–15 seconds.

6. Reset the time and calendar.

⚠️ Always use ESD-safe tools to prevent static discharge that can harm the circuit.

6. Troubleshooting & Common Issues

7. Watch Applications

The Seiko 2626A was widely used in ladies’ quartz watches from the early 1980s, including:

• Stainless steel or gold-plated cases

• Acrylic or mineral crystals

• Slim round or rectangular designs

• Applied baton hour markers

• Day-date display at 3 o’clock

• References such as:

  • 2626-0030

  • 2626-7000

  • 2626-0040

These watches were marketed as reliable, everyday-wear timepieces with a stylish, feminine appeal.

8. Service Tips

• Avoid lubricating plastic gears

• Always replace gaskets when opening the case for battery service

• Clean under-dial calendar components with pegwood or soft brush

• Verify hand clearance and calendar alignment before reassembly

• If IC failure or quartz drift occurs, consider full movement replacement (common with vintage quartz calibers)

9. Conclusion

The Seiko 2626A is a compact, feature-rich quartz movement that balances day-date utility, hacking precision, and durability in a size tailored for ladies' watches. As a product of Seiko’s early quartz innovation, it continues to perform reliably in many vintage models and remains a worthy candidate for restoration and daily wear. With regular battery maintenance and minimal servicing, the 2626A can provide decades of precise, worry-free timekeeping.