Seiko 2517A - Parts List
Seiko 2517A – Technical Guide
The Seiko 2517A is a compact manual-winding mechanical movement with date display, introduced in the late 1960s to early 1970s. Part of Seiko’s 25xx movement family, the 2517A was designed specifically for ladies’ watches, combining elegant simplicity with robust engineering. It is the predecessor to later 2517B versions and offers a reliable foundation for timekeeping in smaller vintage timepieces.
1. Technical Specifications
| Feature | Details |
|---|---|
| Caliber Number | Seiko 2517A |
| Movement Type | Mechanical – Manual winding |
| Functions | Hour, Minute, Date |
| Jewels | 17 |
| Beat Rate | 21,600 vibrations/hour (6 beats/sec) |
| Power Reserve | ~40 hours |
| Manual Winding | Yes |
| Automatic Winding | No |
| Hacking Seconds | No |
| Calendar Type | Date (non-quickset) |
| Quickset | No |
| Diameter | ~17 mm (~7¾ lignes) |
| Height | ~3.3 mm |
| Shock Protection | Yes (Diashock on balance staff) |
2. Key Features
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Time and date display in an ultra-compact form factor
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Manual-wind only – no automatic rotor
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Non-quickset date: advanced by rotating the hands through 24-hour cycles
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High beat rate (21,600 bph) offers improved timekeeping performance
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17-jewel construction supports essential pivots and gear components for durability
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Commonly used in Seiko ladies’ dress watches
3. Calendar Operation
Setting the Date:
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Pull crown to the time-setting position.
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Rotate the hands forward past 12:00 AM until the date changes.
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Continue advancing in 24-hour cycles to reach the desired date.
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Push crown back in when done.
⚠️ Avoid rotating the hands backward past midnight repeatedly, as this may damage the date gear or jumper.
4. Movement Design
Dial Side:
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Date wheel and jumper spring
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Calendar driving finger
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Hour wheel, minute wheel, cannon pinion
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Setting components: sliding pinion, clutch, and stem
Train Side:
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Mainspring barrel (manually wound)
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Gear train: center, third, fourth, and escape wheels
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Pallet fork and balance wheel
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Click system: ratchet wheel, click spring
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Fine regulator for timing adjustment
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Diashock protection on the balance pivots
5. Servicing Guidelines
Service Interval:
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Every 4 to 6 years depending on usage
Steps:
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Fully disassemble dial, gear train, escapement, and calendar module
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Ultrasonic clean all metal parts; carefully hand-clean the balance and hairspring
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Inspect pivots, jewels, and the mainspring for damage
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Lubricate key points: pivots, pallet stones, escape teeth, barrel arbor, and calendar jump system
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Reassemble with proper endshake and balance freedom
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Regulate for accuracy (~±20–30 sec/day target) using a timing machine
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Verify power reserve and amplitude (≥250° when fully wound)
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