Brand | Seiko |
Caliber Number | 6309, 6309A |
Movement Type | Automatic |
Lignes |
12”’ |
Diameter |
27mm |
Height |
5.3mm thick |
Jewels | 17 |
Vibrations Per Hour |
21,600 bph |
Power Reserve | 47 hours |
Lift Angle |
54.5 degrees (needs confirmed) |
Shock System | Diashock |
Rotor | Ball bearing |
Mainspring | 401615 |
Balance Staff | 311601 |
Hands | 1.5mm x 0.90mm x 0.20mm |
Hacking? | No |
Manual Winding? | No |
Crown Location | 4:00 |
Functions | Hours, minutes, central seconds, quickset bi-lingual day, quickset date |
Country of Manufacture | Japan |
Known Models | 6309 (add more in the comments below…) |
The Seiko caliber 6309 is a vintage automatic workhorse movement that was found in many Scuba Diver models, seiko 5, and dress watches in the 1980’s.
Note: This caliber is sometimes mistaken as being 6809 (6809A) by folks who can’t see the 3 clearly.
Some of the topics covered in this caliber listing:
In Seiko’s own words:
In old Seiko documentation, they refer to the 6309 as a Highly Reliable Movement:
The highly stabilized accuracy and high reliability established for the 61XX series has been incorporated into the movement.
Also mentioning easy servicing:
Disassembling and reassembling procedures and serviceability have been improved largely by:
- Employment of a new balance hairspring holding device (aka no stud for the hairspring since it clamps directly in the terminal)
- Decrease in number of parts from the simplification of the movement structure.
- Decrease in number of new parts resulting from interchangeability of some parts with Cal. 61XX series.
Variations:
There are different variations of this movement, including Seiko caliber 6308A (17J), 6319A (21J), 6347A (moonphase, 23J), 6349A (23J).
Community Commentary:
In an interesting thread on the Military Watch Resource forum comparing the Seiko caliber 6309 to the ETA caliber 2824, shortwave said:
I have a 25 year old 6309 7290. It hasn’t been cleaned in at least 10 years. It advances 1 to 2 seconds in 12 days. I’ve never seen such accuracy in any
manualwatch. The ETA in my Marathon, gains seconds a day.
Video of Servicing:
Additional Resources:
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