Seiko 6R24

	Brand:	Seiko, Seiko Instruments Inc.
	Family:	Seiko 6R Family
	Height:	6.15 mm
	Jewels:	31
	Reserve:	45 hours
	Frequency:	28,800 A/h
	Winding:	Automatic, Bi-Directional Automatic Winding, Central Rotor Automatic Winding
	Diameter:	27.40 mm (12 ligne)
	Complications:	Date, Day, Hacking Seconds, Hand Winding, Power Reserve Indicator, Quick Date Correction, Quick Day Correction, Retrograde Date, Retrograde Day
	Hands:	Central Hour Hand, Central Minute Hand, Central Seconds Hand, Date Pointer at 6:00, Day Pointer at 3:00, Power Reserve Pointer at 9:30

Distinguishing Technical Characteristics
Central-Rotor Automatic Counter-Clockwise Balance Cock Etachron Regulator Balance Balance at 3:00 Central Rotor
Production: 2009 – Current
1910s	1920s	1930s	1940s	1950s	1960s	1970s	1980s	1990s	2000s	2010s	2020s

Seiko Cal. 6R24 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: Retrograde day at 2:30, retrograde date at 6:00, and retrograde power reserve at 9:30.

Cal. 6R24 was introduced around 2009 and remains in production today. It has 31 jewels and 224 parts. Cal. 6R24 was used in the Ananta Double Retrograde Automatic watches, models SPB013J1 and SPB015J1, produced August 2009 through July 2012.

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

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