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You are here: Home / Movements / Seiko 6R15

Seiko 6R15

Last Update: July 7, 2019

Brand:Seiko, Seiko Instruments Inc., Time Module Inc.
Family:
Seiko 6R Family
Height:5.25 mm
Jewels:23
Reserve:50 hours
Frequency:21,600 A/h
Winding:Automatic, Bi-Directional Automatic Winding, Central Rotor Automatic Winding
Diameter:27.40 mm (12 ligne)
© Seiko  Complications:Date, Hacking Seconds, Hand Winding, Quick Date Correction
Hands:Central Hour Hand, Central Minute Hand, Central Seconds Hand, Date Window at 3:00
Distinguishing Technical Characteristics
Central-Rotor Automatic
Counter-Clockwise Balance Cock
Etachron Regulator
Balance
Balance at 3:00
Central Rotor
Production: 2006 – Current
1910s 1920s 1930s 1940s 1950s 1960s 1970s 1980s 1990s 2000s 2010s 2020s

Seiko Cal. 6R15 is a midrange automatic movement produced by Seiko Instruments Inc. (SII) for Seiko watches. Since 2010, it is also sold by Time Module Inc. (TMI) as Cal. NE15 for use by other manufacturers. Although not a high-beat movement, it is more refined and accurate than the related Seiko 4R series and uses a Spron 510 mainspring for 50 hour power reserve. Cal. 6R35 is similar but with a longer 70 hour power reserve.

Seiko Cal. 6R15D in Japan-market SARX053

The original movement was Cal. 6R15A, but this was updated with unspecified replacement parts as Cal. 6R15B. Cal. 6R15C has additional new parts but retains the case spring at 8:00 for use in A/B watches, while Cal. 6R15D lacks this spring but is otherwise similar.

Cal. 6R15 was introduced around 2006 and remains in production today. It has 23 jewels and 168 parts. Cal. 6R15 was used in the Premier Automatic watches, models SPB007J1, SPB009J1, and SPB011J1, produced October 2007 through July 2011.

Seiko builds Cal. 6R20, 6R21, 6R24, and 6R27 using modules on the 6R15 base. These movements also use a Hi-Beat 28,800 A/h balance.

Seiko 6R15 Applications

As of 2020, Seiko uses Cal. 6R15 in some higher-end Presage and Prospex models.

  • Seiko Presage SPB047
  • Seiko Presage Tonneau SPB049
  • Seiko Prospex Diver’s 200M SPB051, SPB053, SPB071
  • Seiko Prospex Diver’s 200M SPB077, SPB097, SPB105
  • Seiko Prospex Diver’s 200M SPB079, SPB087
Seiko Premier Tonneau SPB049 with Cal. 6R15D
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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