Seiko 4S24

	Brand:	Seiko
	Family:	Seiko 4S Family
	Height:
	Jewels:	21
	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, Central Seconds Hand

Distinguishing Technical Characteristics
Hand-Winding Clockwise Balance Cock Screw Regulator Balance, Balance at 5:00
Production:  –
1910s	1920s	1930s	1940s	1950s	1960s	1970s	1980s	1990s	2000s	2010s	2020s

Cal. 4S24 is a hand-winding movement central seconds. 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. 4S24 is very similar to Cal. 4S28, which has a small seconds subdial rather than central seconds. It is also closely related to Cal. 4S15, which is an automatic movement with date.

Cal. 4S24 was rarely used but was notable as the movement in the Laurel historical reissue, catalog number LJAL601.

• Seiko Laurel LJAL600 (twisted lugs, steel and gold, cream dial)
• Seiko Laurel LJAL601 (twisted lugs, steel, white dial)
• Seiko Laurel LJAL602 (plain lugs, steel, white dial)
• Seiko Laurel LJAL603 (plain lugs, steel, black dial)
• Seiko Laurel LJAL604 (plain lugs, steel, cream dial with Roman numerals)
• 1998 Seiko Hand Winding SCVG004
• 1998 Seiko Hand Winding SCVG005
• 1998 Seiko Hand Winding SCVG007

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.