Seiko Caliber 7002A

Brand	Seiko
Caliber Number	7002, 7002A
Movement Type	Automatic
Diameter	12”’ (27mm)
Thickness	4.5mm
Jewels	17
Vibrations Per Hour	21,600 bph
Power Reserve	Up to 43 hours on a full charge
Shock System	Diashock
Winding System	Seiko Magic Lever
Winding Direction	Bi-directional
Crown Location	4:00
Hacking?	No
Hand-Windable?	No
Hand Sizes	1.50mm / 0.90mm / 0.20mm
Functions	Hours, minutes, central seconds, quickset date at 3:00
Country of Manufacture	Singapore
Known Models	7002-700A, 7002-700J, 7002-7039, 7002-7020, 7002-7009, Sports 50 (Add yours to the comments below…)

The Seiko caliber 7002A is an automatic movement with 17 jewels found in many pre-SKX Seiko divers. This caliber was introduced in the late 1980s after Seiko started to phase out the production of the caliber 6309 around 1988. Seiko produced the 7002 until circa 1996 – which is when the caliber 7S26 was introduced.

Power Reserve:

Without a hand-winding function, this movement can take some time to reach full power reserve. Achieve this by continuously wearing your watch and/or shaking it side to side. Once full power reserve is realized, the movement should run for approximately 40 hours, up to 43 hours continuously.

Different Versions:

From an article on Time Zone by Rob B:

Consulting the Seiko parts catalogs revealed that the cals 7002, 7005 7006 and 7009 are almost identical, sharing many parts in common. The main difference is in thickness, day/date features and jewelling. The 7005 is date only, the 7009 is a day/date and the 7002A is date only and has a different auto winding weight. Since this particular movement is a “date only”, then one concludes it started life as a 7005A, to be transfomed at a later date by whatever parts were to hand at the time…

Additional Images:

Video:

The video gut shot below is of a Seiko caliber 7002A from a vintage Scuba Diver’s model 7002-700J (case number).

Additional Resources:

• Official 7002 instruction manual

Share your experience with the Seiko caliber 7002A in the comments below…