Introduction to the Seiko 7625A

The Seiko 7625A is a vintage mechanical automatic movement developed in the 1960s, part of Seiko's reputable 76xx series. This caliber was used in various models including the Seikomatic, Seiko Sportsmatic 5, and early Seiko 5 watches. Known for its rugged reliability, day-date functionality, and fully automatic winding, the 7625A played an important role in establishing Seiko’s reputation for producing affordable yet high-quality self-winding watches.

Unlike some other 76-series movements, the 7625A does not support hand-winding, relying solely on automatic operation.

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Technical Specifications

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Functions and Display

• Central hour, minute, and seconds hands

• Day and date window typically at 3 o'clock

• Quickset date via crown pull-push method

• Day adjustment through 24-hour cycling (no quickset)

The 7625A’s day-date system was common in Seiko 5 watches and helped standardize affordable complications across the Seiko line.

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Operation and Crown Functions

To change the day, rotate the hands past midnight repeatedly. To quickset the date, press the crown inward with a light push (do not rotate).

Note: Avoid using the quickset function between 9:00 PM and 3:00 AM, as the calendar gear is engaged and could be damaged.

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Automatic Winding System

The 7625A uses Seiko's early Magic Lever system, which allows for:

• Bidirectional winding

• Simple and efficient construction

• Fast charging of the mainspring with minimal wrist movement

While the movement lacks a manual winding option, the Magic Lever ensures that energy is built up quickly with normal wear.

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Servicing and Maintenance

As a vintage mechanical movement, the 7625A requires periodic servicing for continued accuracy and reliability.

Recommended Service Interval:

• Every 4–6 years, depending on use and storage

Common Service Tasks:

• Complete disassembly and cleaning

• Lubrication of escapement, pivots, and barrel

• Regulation to ±30 seconds/day

• Inspection and adjustment of the calendar mechanism

• Gasket replacement if used in water-resistant cases

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Known Issues and Solutions

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Watch Models Featuring the 7625A

• Seiko Sportsmatic 5 6619-8230 / 7625-8063

• Seikomatic models with day-date

• Early Seiko 5 models (mid-1960s)

• Export models with English + local language (Spanish, Kanji, etc.)

These watches often had monocoque cases or snap-on backs, domed acrylic crystals, and strong mid-century styling.

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Collector Notes

Collectors admire the 7625A for its:

• Role in the early Seiko 5 lineup

• Dependable automatic winding system

• Minimal maintenance requirements for a 1960s design

• Accessible spare parts, thanks to compatibility across the 76xx family

Although the 7625A lacks modern features like hacking or manual winding, its simple engineering and robust build make it a great choice for vintage watch enthusiasts and restorers.

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Conclusion

The Seiko 7625A is a vintage automatic workhorse that helped build Seiko’s reputation for making reliable, everyday mechanical watches. With features such as:

• Automatic winding with Magic Lever

• Quickset date (push crown)

• Durable 17-jewel movement

• Classic 18,000 bph beat rate

…it remains a sought-after caliber for collectors of 1960s and early 1970s Seiko watches. For those looking to restore or collect Seiko’s early automatic offerings, the 7625A stands as a dependable and historically significant movement that still performs reliably today.

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