The Seiko 7S26A is an automatic mechanical caliber of the Seiko 7S family, introduced in the 1990s to equip many Seiko 5s and diver's watches. It combines bi-directional automatic winding, central seconds and day-date calendar. Variants A, B and C correspond to successive revisions of the same movement.
2 documentsENFR
Dial sideBalance side
MOVEMENT RESOURCES
Everything in one place.
The complete workshop lubrication plan remains the primary resource, bringing together the photographic work, reference points and detailed checks. Other resources are provided as complements.
WORKSHOP DOCUMENT · COMPLETE PDFPrimary resource
Lubrication chart
Lubrication points, products, dry areas and checks gathered in a workshop PDF designed to be used while working on the movement.
PDF HD · EN
Immediate access after payment
PDF personalised per licence
Personal one-time download link
Complementary resourcesNo payment · no account
TECHNICAL DOCUMENT · PDFOpen access
Technical guide
A high-definition workshop document structured for direct use at the bench, so the useful information is quick to find.
PDF HD · FR
Direct download
No payment · no account
SPECIFICATIONS
PeriodSince 1996; variants A, B and C according to production revisionsManufacturerSeikoWindingAutomatic bidirectional, without manual winding by the crownFrequency21,600 vibrations/hour (3 Hz)Jewels21 rubiesPower reserveApprox. 40 hrsDiameter27.0mm casing (27.4mm overall)Height4.9mmComplicationsDay, Date, Center Seconds, Quick Calendar Correction
