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You are here: Home / Movements / Seiko 4S15

Seiko 4S15

Last Update: February 5, 2020

Brand:Seiko
Family:
Seiko 4S Family
Height:4.17 mm
Jewels:25
Reserve:40 hours
Frequency:28,800 A/h
Winding:Automatic, Bi-Directional Automatic Winding
Diameter:25.60 mm (11.5 ligne)
  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
Clockwise Balance Cock
Screw Regulator
Balance
Balance at 4:30
Barrel at 12:00
Production: 1995 – 2006
1910s 1920s 1930s 1940s 1950s 1960s 1970s 1980s 1990s 2000s 2010s 2020s

Cal. 4S15 is an automatic movement with date developed by Seiko in the early 1990s. It was based on the Seiko 52 stream of movements, which had been retired in 1976, and was responsible for Seiko’s resurgence as a maker of high-end watches. Cal. 4S15 was used in many popular watches, including the SUS military watch, Alpinist expedition watch, 200 meter diver scuba, and the 2000 King Seiko reissue.

Cal. 4S15 is identical in design to Cal. 4S25 and the high-spec Cal. 4S35. The only differences are in finishing and regulation, with Cal. 4S15 and 4S25 delivering -15/+25 seconds per day compared to -10/+15 seconds for Cal. 4S35.

This 1998 Seiko catalog page shows the SUS SCFF watches along with Cal. 4S15

Cal. 4S15 was used in a variety of Seiko models, including Brightz, Alpinist, SUS military, the Titanium Scuba Diver’s, and the famous Historical Collection King Seiko reissue.

  • 1996-1997 Seiko SUS SCFF
  • 1996 Seiko Laurel LHAM600 (blue dial)
  • 1996 Seiko Laurel LHAM601 (white dial)
  • 1998-1999 Seiko Titanium Scuba Diver’s SCVF001
  • 1998-1999 Seiko Titanium Scuba Diver’s SCVF003
  • 1998-2001 Seiko Alpinist SCVF005
  • 1998-2001 Seiko Alpinist SCVF007
  • 1998 Seiko Alpinist SCVF009
  • 2000 Seiko Historical Collection King Seiko reissue SCVN001
  • 2006 Seiko SAGN001 (Limited Edition of 500 in Brightz titanium)
SAGN001 was an anomaly in 2006: It was the only Brightz model to use Cal. 4S15 and brought the movement back a decade after introduction

Early Seiko 4S Movements

From the 1992 introduction of the Seiko 4S family through the early 2000s, Seiko used the 4S line as a high-end movement for diverse watches, including the SUS military, Alpinist, and Titanium diver. Most of these models were retired shortly after introduction, and the series of simple 4S movements was phased out by 2003.

ProductionWatchWindingJewelsNotes
4S121997-1998SCFFAutomatic25Date
Fixed 24 hour hand
4S151995-2001
2006
LHAM
SCFF
SCVF
SCVN
Automatic25Date
4S241990sLJAL
SCVG
Manual21
4S251993-1998SCVH
SCVJ
Automatic25Date
4S281994-2000LJAK
SCVG
SCVM
Manual24Small seconds at 6:00
4S351992-2000SCVKAutomatic25Date
4S711995-2003GCBBAutomatic25
Images are taken from official publications and are used here for commentary and educational purposes. Copyright is held by the original owner as noted.
External Link

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