Seiko 4500A - Parts List
Seiko 4500A – Technical Guide
General Overview
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Caliber: Seiko 4500A
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Type: Manual-wind mechanical movement
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Manufacturer: Daini Seikosha (Seiko Instruments Inc.)
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Production Period: Late 1960s to early 1970s
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Series: 45-series high-precision movements
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Primary Use: King Seiko (time-only models)
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Notable Feature: High-beat movement with precision-focused design
Technical Specifications
| Feature | Specification |
|---|---|
| Winding System | Manual winding |
| Jewels | 25 |
| Frequency | 36,000 A/h (10 beats per second) |
| Power Reserve | ~40 hours |
| Shock Protection | Diashock (on balance staff) |
| Hacking Seconds | No |
| Calendar | None |
| Movement Diameter | Approx. 26.0 mm |
| Movement Height | Approx. 4.0 mm |
| Finishing | Fine brushing, polished screws |
Functional Description
The Seiko 4500A is a high-beat, time-only caliber used in the King Seiko 45KS series. Designed for chronometer-level precision, this movement was part of Seiko’s effort to surpass Swiss mechanical standards in the late 1960s.
Crown Operation
| Position | Function |
|---|---|
| 0 | Manual winding |
| 1 | Time setting |
This is a simple, elegant movement with no calendar, no hacking, and no automatic winding, prioritizing accuracy and reliability above all.
Watch Models Using 4500A
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King Seiko 45-7000
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King Seiko 45-8000
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King Seiko 45-8010
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These watches often featured:
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36 mm stainless steel cases
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Minimalist dials with baton markers
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“Hi-Beat” or “King Seiko” logos
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Manual-wind only crown at 3 o’clock
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Seiko’s “Grammar of Design” inspired lugs and polishing
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Performance and Accuracy
| Metric | Target Post-Service |
|---|---|
| Daily Accuracy | ±5 to ±15 seconds/day (well regulated) |
| Amplitude | 240°–270° (fully wound, dial up) |
| Beat Error | ≤ 0.3 ms |
| Frequency | 36,000 A/h (10 beats/sec, high-beat) |
The high-beat architecture allows for more frequent escapement ticks, which improves timekeeping stability and smoothens the seconds hand motion.
Disassembly and Service Notes
| Component | Watchmaker Notes |
|---|---|
| Balance Assembly | Very fine pivots — avoid shock or misalignment |
| Train Wheels | High-beat design increases wear — inspect under magnification |
| Barrel and Mainspring | Replace if amplitude is low — aging reduces torque in high-beat |
| Keyless Works | Simple and open — easy to clean and lubricate |
| Regulator | Use fine-tipped tools — sensitivity is higher due to beat rate |
Because this is a high-beat movement, friction and cleanliness are critical. Always inspect the escape wheel teeth and train pivots closely.
Lubrication Guide
| Location | Lubricant Type |
|---|---|
| Train Wheel Pivots | Moebius 9010 |
| Escape Wheel Teeth | Moebius 941 |
| Pallet Stones | Moebius 941 |
| Balance Cap Jewels | Moebius 9010 |
| Barrel Arbor & Bridle | Moebius 8200 |
| Keyless Works | Molykote DX |
Apply lubrication sparingly. Excess oil can affect amplitude in high-frequency escapements.
Common Issues and Fixes
| Problem | Likely Cause | Recommended Solution |
|---|---|---|
| Low amplitude | Dirty train or old mainspring | Full clean and mainspring replacement |
| Irregular timing | Worn or dry pallet stones | Clean, lubricate, or replace |
| Time slows dramatically | Escape wheel tooth wear | Inspect under magnification |
| Resistance in winding | Dirty crown wheel or click | Clean and re-lubricate keyless works |
Collectibility and Value
The Seiko 4500A is highly regarded among vintage Seiko collectors. Its simple architecture, high-beat design, and history tied to King Seiko’s golden era make it a desirable movement.
| Condition | Value (complete watch) |
|---|---|
| Running, worn case | $300–$500 |
| Serviced, original dial | $600–$900 |
| Excellent or boxed | $1,000–$1,500+ |
Standalone movements or parts are harder to find due to limited production and collector demand.
Conclusion
The Seiko 4500A is a beautiful example of late-1960s Japanese horological excellence. With its clean layout, 10-beat high-frequency design, and no-complication purity, it remains a favorite among serious Seiko collectors. Whether for restoration, regulation, or appreciation, it showcases the refined performance Seiko achieved before the quartz revolution.
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