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.
|6R20||29||208||28,800||45||Day Subdial||Date Subdial||Clockwise|
|6R21||29||208||28,800||45||Day Subdial||Date Subdial||Counter-Clockwise|
|6R24||31||224||28,800||45||Retrograde Day||Retrograde Date||Clockwise|