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You are here: Home / Movements / Seiko 4S28

Seiko 4S28

Last Update: February 5, 2020

Brand:Seiko
Family:
Seiko 4S Family
Height:
Jewels:24
Reserve:40 hours
Frequency:28,800 A/h
Winding:Hand winding
Diameter:25.60 mm (11.5 ligne)
  Complications:Hacking Seconds
Hands:Central Hour Hand, Central Minute Hand, Small Seconds Hand at 6:00
Distinguishing Technical Characteristics
Hand-Winding
Clockwise Balance Cock
Screw Regulator
Balance
Balance at 4:30
Barrel at 12:00
Production: 1994 – 2000
1910s 1920s 1930s 1940s 1950s 1960s 1970s 1980s 1990s 2000s 2010s 2020s

Cal. 4S28 is a hand-winding movement with small seconds at 6:00. It was developed by Seiko in the early 1990s and is based on the Seiko 52 stream of movements, which had been retired in 1976. Cal. 4S28 is very similar to Cal. 4S24, which has central seconds rather than the subdial. It is also closely related to Cal. 4S15, which is an automatic movement with date.

Cal. 4S28 was notably used in the 2000 Historical Collection Laurel reissue, catalog number SCVM001.

  • 1994-1998 Seiko Pocket Watch SCVG001
  • 1995-1998 Seiko Pocket Watch SCVG002
  • 1996 Seiko Laurel LJAK600 (steel and yellow gold, white dial)
  • 1996 Seiko Laurel LJAK601 (steel, blue dial)
  • 1996 Seiko Laurel LJAK602 (steel, white dial)
  • 2000 Seiko Historical Collection Laurel SCVM001
  • 2000 Seiko Laurel SCVM001 (LE of 1000)

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

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