Seiko 6R Family

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BRANDS: Seiko, Seiko Instruments Inc., Time Module Inc.

Production: 2006 – Current
1910s	1920s	1930s	1940s	1950s	1960s	1970s	1980s	1990s	2000s	2010s	2020s

Seiko’s 6R family of movements is an upscale line for higher-end watches. Launched in 2006, Cal. 6R15 was a modification of the mainstream 7S family but with better finishing and a Spron 510 mainspring. Seiko later created Cal. 6R20 and other movements with modules on the 6R15 and a Hi-Beat 28,800 A/h escapement. These movements also add hacking and hand winding as on the derived 4R family.

In 2019, Seiko revisited the aging 6R family, adding the new Cal. 6R35. A simple movement like Cal. 6R15, it operates at 21,600 A/h and has only a date complication. It adds one additional jewel, however, and boasts a 70 hour power reserve.

	Jewels	Components	Speed	Power	3:00	6:00	9:00
6R15	23	168	21,600	50	Date Window
6R20	29	208	28,800	45	Day Subdial	Date Subdial	Clockwise Power Reserve
6R21	29	208	28,800	45	Day Subdial	Date Subdial	Counter-Clockwise Power Reserve
6R24	31	224	28,800	45	Retrograde Day	Retrograde Date	Clockwise Power Reserve
6R27	29		28,800	45		Date Subdial	Counter-Clockwise Power Reserve
6R35	24		21,600	70	Date Window

Calibre	Start Year	End Year	Diameter (mm)	Diameter (ligne)	Height (mm)	Complications
Seiko 6R15	2006	Current	27.40	12	5.25	Date, Hacking Seconds, Hand Winding, Quick Date Correction
Seiko 6R20	2007	Current	27.40	12	6.15	Date, Date by Pointer, Day, Day by Pointer, Hacking Seconds, Hand Winding, Power Reserve Indicator, Quick Date Correction
Seiko 6R21	2009	Current	27.40	12	6.15	Date, Date by Pointer, Day, Day by Pointer, Hacking Seconds, Hand Winding, Power Reserve Indicator, Quick Date Correction, Quick Day Correction
Seiko 6R24	2009	Current	27.40	12	6.15	Date, Day, Hacking Seconds, Hand Winding, Power Reserve Indicator, Quick Date Correction, Quick Day Correction, Retrograde Date, Retrograde Day
Seiko 6R27	2013	2016	27.40	12	5.32	Date, Date by Pointer, Power Reserve Indicator, Quick Date Correction
Seiko 6R35	2019	Current				Date, Hacking Seconds, Hand Winding, Quick Date Correction