Seiko 4336A - Technical Guide
Seiko 4336A – Technical Guide
General Overview
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Movement Caliber: Seiko 4336A
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Type: Automatic mechanical
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Manufacturer: Suwa Seikosha (Seiko Group)
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Production Era: Early to mid-1980s
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Series: 4300-series compact automatic calibers
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Primary Use: Ladies’ automatic watches
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Key Feature: Compact automatic with quickset day-date and improved calendar durability
Technical Specifications
| Feature | Specification |
|---|---|
| Winding System | Automatic only (no manual winding) |
| Rotor Direction | Bidirectional |
| Jewels | 21 |
| Frequency | 21,600 A/h (6 beats per second) |
| Power Reserve | Approximately 40 hours |
| Shock Protection | Diashock (balance staff) |
| Hacking Seconds | No |
| Calendar | Day (bilingual) + Date, both quickset |
| Movement Diameter | ~17.0 mm |
| Movement Height | ~4.4 mm |
Functional Description
The Seiko 4336A is a compact automatic movement designed for use in smaller dress watches. It includes a full calendar display with dual quickset functionality, and its components reflect subtle refinements over earlier 4300-series movements. The movement is engineered to maintain timekeeping reliability while minimizing thickness.
Crown Operation
| Position | Function |
|---|---|
| 0 | Normal position (worn, rotor winds the mainspring) |
| 1 | Quickset: clockwise for date, counterclockwise for day |
| 2 | Time setting (non-hacking) |
Calendar System
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Day wheel: Bilingual (English/French, English/Spanish, or other depending on region)
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Date wheel: Numeric 1–31
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Quickset day and date using crown at position 1
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Date changeover occurs between approximately 10:30 PM and midnight
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Drive system: Cam and spring jumper, with improvements in gear teeth profiles and tension control
Watch Applications
The 4336A was used in several ladies’ Seiko watches featuring:
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Case diameters between 26 and 30 mm
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Framed day and date apertures at 3 o’clock
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Dial markings such as “Automatic,” “21 Jewels,” and “Japan”
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Steel or gold-tone dress cases with both bracelet and leather strap options
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Seiko 5 and non-Seiko 5 models
Disassembly and Servicing Notes
This movement follows the same servicing approach as other 4300-series calibers, with careful attention needed due to the compact scale.
| Component | Watchmaker Notes |
|---|---|
| Rotor | Remove carefully; fine threads and narrow rotor post |
| Calendar plate | Use Rodico when removing to prevent loss of small jumper springs |
| Date and day wheels | Use plastic tweezers to avoid scratching the printed surfaces |
| Train bridge | One-piece bridge; support wheels when lowering |
| Balance assembly | Pivot holes are fine; always check cap jewel oil before closing |
Lubrication Chart
| Location | Lubricant Type |
|---|---|
| Train wheel pivots | Moebius 9010 |
| Escape wheel teeth | Moebius 941 |
| Pallet stones | Moebius 941 |
| Balance endstones | Moebius 9010 |
| Barrel arbor and bridle | Moebius 8200 |
| Calendar works and keyless | Molykote DX or HP1300 |
Performance Targets
| Metric | Target Value (Post-Service) |
|---|---|
| Daily Accuracy | ±15 to ±25 seconds/day |
| Amplitude | 230°–260° fully wound (dial up) |
| Beat Error | ≤0.5 ms |
Common Issues and Fixes
| Problem | Cause | Recommended Solution |
|---|---|---|
| Quickset day or date fails | Worn intermediate gear or bent spring | Replace gear and inspect alignment |
| Day/date misalignment | Hands installed out of sync | Reinstall hands after proper rotation |
| Rotor noisy or freewheeling | Loose or dry rotor screw/post | Tighten and lubricate as needed |
| Low power reserve | Aged or slipping mainspring | Replace or service the mainspring barrel |
Collectibility and Value
The 4336A is not widely known outside dedicated Seiko collectors, but it offers value as a reliable, small-format movement with dual quickset functionality. It is especially useful for restorers of vintage ladies’ automatic watches.
Estimated values for watches with this caliber:
| Condition | Value Range |
|---|---|
| Working condition | $50–$90 |
| Excellent/restored | $100–$150+ |
| NOS or boxed | $150–$200+ |
Conclusion
The Seiko 4336A is a refined compact automatic caliber with robust day-date performance and dependable engineering. It is part of Seiko’s enduring commitment to quality even in smaller watches. This movement continues to be appreciated by collectors, restorers, and daily wearers seeking reliability in a vintage ladies’ automatic.
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