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seiko_6r15

Seiko 6R15

6R15 is one of a family of modern automatic upper-midrange watch movements from Seiko. The 6R15 is also sold as the NE15A. A “high beat” derivative with a chronograph module is also available, called the Seiko 8R28.

Overview

The 6R15 family was introduced in 2006 as a higher-spec derivative of the familiar Seiko 7S26. It was intended to replace the expensive “high beat” King Seiko-derived 4S15 in mainstream watches, allowing that family to be used exclusively in more expensive models.

The 6R is an automatic movement which adds hacking and hand winding to the existing 7S26 base. This is the main difference between the movements The winding works now include two separate pinions on the bottom plate to add hand winding. It also features a hacking mechanism and pinned balance spring for adjustability. Thanks to a Spron 510 mainspring, the 6R15 boasts 50 hour power reserve, and the faster-beating 6R2x series has a 45 hour power reserve.

The 6R20 differs from the base 6R15 in many ways. It beats at 28,800 vph and features a power reserve indicator and both day and date in a window. The derived 6R21 and 6R24 also beat at 28,800 and have power reserve indicators but add day and date on subdials (sweep for the 6R21 and retrograde for the 6R24).

As of 2018, the 6R15 is used in the Seiko Prospex SBD series of watches, which start at $600, as well as the higher-end Prospex and Presage SPB and Seiko Core SDG.

Variants

MovementBeatWindingHandsDateSubdialJewelsPower reserve
6R1521,600AutomaticHour, minute, secondsDate windowNone2350 hours
6R2028,800AutomaticHour, minute, secondsDay and date windowPower reserve indicator2945 hours
6R21AutomaticHour, minute, secondsSweep day and date subdialsPower reserve indicator
6R24AutomaticHour, minute, secondsRetrograde day and date subdialsPower reserve indicator31
6R27AutomaticHour, minuteSweep date subdialSweep date, retrograde power reserve indicator29

Seiko 7S Family

The following movements were all based on the Seiko 7S26 movement.

GroupYear
Introduced
MovementsMainspringHacking/
Hand-winding
7S19967S25, 7S26, 7S35, 7S36, 7S55TraditionalNo
6R1x20066R15, 6R20, 6R21, 6R24Spron 510Yes
4R1x20084R15, 4R16Spron 510No
4R3x20114R35, 4R36, 4R37, 4R38, 4R39, 4R71TraditionalYes

Applications

The Seiko 6R15 is commonly found in upper-midrange models, but was also used in Seiko's 100th anniversary “Laurel” tribute, SARX011. 6R27 is very rare, only used in the 100th anniversary “Laurel” tribute, SARW005.

By Model Line

  • 6R15
    • SARB “Cocktail Time” and “Alpinist”, SARG, SARX “Presage”, SBDC “Field Master”
  • 6R27
    • SARW “Presage”

Description:

Functions:

Data:

  • Diameter 12 ligne (27.4 mm), Height 5.32 mm
  • 23 jewels
  • 21,600 A/h
  • Power reserve 50 hours

Production period:

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seiko_6r15.txt · Last modified: 11.10.2021 21:09 (external edit)

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