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You are here: Home / Movements / Seiko 6R27

Seiko 6R27

Last Update: July 9, 2019

Brand:Seiko, Seiko Instruments Inc.
Family:
Seiko 6R Family
Height:5.32 mm
Jewels:29
Reserve:45 hours
Frequency:28,800 A/h
Winding:Automatic, Bi-Directional Automatic Winding, Central Rotor Automatic Winding
Diameter:27.40 mm (12 ligne)
© Seiko Seiko Presage SARW051 with Cal. 6R27C Complications:Date, Date by Pointer, Power Reserve Indicator, Quick Date Correction
Hands:Central Hour Hand, Central Minute Hand, Central Seconds Hand, Date Pointer at 6:00, Power Reserve Pointer at 9:00
Distinguishing Technical Characteristics
Central-Rotor Automatic
Counter-Clockwise Balance Cock
Etachron Regulator
Balance
Balance at 3:00
Central Rotor
Production: 2013 – 2016
1910s 1920s 1930s 1940s 1950s 1960s 1970s 1980s 1990s 2000s 2010s 2020s

Seiko Cal. 6R27 is a midrange automatic movement produced by Seiko Instruments Inc. (SII) for Seiko watches. Like other Seiko 6R movements, it is more refined and accurate than the related Seiko 4R series and uses a Spron 510 mainspring. Unlike Cal. 6R15, it is a “Hi-Beat” movement operating at 28,800 A/h and has complications: Date subdial at 6:00 and retrograde power reserve at 9:00. The SARW005 Laurel tribute lacks the central seconds hand of all other 6R movements.

According to Seiko documents, this is a modular movement based on Cal. 6R15 but with a Hi-Beat balance.

Seiko 6R27 Applications

Cal. 6R27 was only used in a few watches. As of 2020 it is found in 3 models.

  • 2013 SARW005 – 100th anniversary Laurel tribute
  • 2016 SARW027 – 60th Anniversary Presage (limited to 1956 examples)
  • Seiko Presage SPB045, SPB091
  • Seiko Presage Arita Porcelain Dial SPB093
Seiko Presage SPB093 with Cal. 6R27C
JewelsComponentsSpeedPower3:006:009:00
6R152316821,60050Date Window
6R202920828,80045Day SubdialDate SubdialClockwise
Power Reserve
6R212920828,80045Day SubdialDate SubdialCounter-Clockwise
Power Reserve
6R243122428,80045Retrograde DayRetrograde DateClockwise
Power Reserve
6R272928,80045Date SubdialCounter-Clockwise
Power Reserve
6R352421,60070Date Window
Images are taken from official publications and are used here for commentary and educational purposes. Copyright is held by the original owner as noted.
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