Manufacturer | Seiko |
Caliber Number | 2906, 2906A |
Movement Type | Automatic |
Diameter | 18mm (casing) |
Height | 5.35mm |
Jewels | 17 |
Vibrations Per Hour | 28,800 bph |
Lift Angle | Unconfirmed (add to comments below…) |
Shock System? | Dia-shock |
Power Reserve | Unconfirmed (add to comments below…) |
Winding Direction | Bi-directional |
Hacking? | No |
Hand-Windable? | Yes |
Quick Set Calendar? | Yes |
Magnetic Resistance | 4,800 A/m (60 gauss) |
Functions | Hours, minutes, central second hand, day (bi-lingual) and date at 3:00 |
Country of Manufacture | Japan |
Known Models | Ladies Seiko 5 (Add yours in the comments below) |
The Seiko caliber 2906A is an automatic movement found in ladies Seiko watches. It has 17 jewels and a hi-beat rate of 28,800 vph. Made in Japan.
Caliber 2906 Vs 2906A:
2906 and 2906a are the same. The dial and caseback of the watch may reference 2906, but the rotor will say 2906A. The letter signifies the evolution or version of the movement, starting with A.
Features listed in old Seiko Documentation:
- Thin automatic day and date lady’s watch – Having the technically excelled mechanism as with Cal. 2706 which has obtained a worldwide reputation for its high precision mechanism and variety of functions as a lady’s watch, this watch offers a greater variety in design by making its movement slimmer than Cal. 2706.
- Movement of highly stabilized time accuracy – This movement is specially designed on the basis of the highly reliable movement mechanism of Cal. 61 series which have been marketed with a reputation on the overseas market.
- Easy-to-use day/date setting device – The day/date setting can be simply operated by turning the crown clockwise or counterclockwise after pulling out the crown in the 1st click position. At the same time, either of the two languages provided can be easily set to indicate the day of the week by the bilingual changeover system.
- Simplified movement structure – A sophisticated design of the watch movement has made it possible to reduce the number of parts and made it possible to adopt the new balance spring holding device. Thus, the simplified movement structure facilitates easy after-servicing.
Crown Position Functions:
0 (against the case): Clockwise = Manual Winding / Counterclockwise = Nothing
1 (pulled out one click): Clockwise = Date setting / Counterclockwise = Day setting
2 (pulled out two clicks): Time setting clockwise and counterclockwise
Additional Resources:
Recent Comments
hello, does anyone know if it is 1:1 clone of the 6498/6497 in terms of…
Glad you think so. Thank you for the comment!
Informative. Thank you!
Mixed experience with this caliber, I have 2 watches with it, the first one is…
NH35 rotors and cases will fit an NH70. The only NHxx I can think of…
Also in the Ollech & Wajs M52
I really want to buy a custom rotor for this and it is way easier…