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Movement · Seiko · automatic

Seiko 6R55 movement

Seiko 6R55 is an automatic movement by Seiko: 241 jewels, beating at 21,600 bph1, 72 h1 of power reserve.

Sources checked · How we source numbers
Seiko 6R55: movement drawingSeiko 6R55, dial side, to scale: movement diameter — (unknown); date 3H window (size unknown); height — (unknown); hour, minute, second hand hole Ø — (unknown).movement Ø —date 3Hsize —, position onlyheight —SIDEAhour, minute, second hand hole Ø —DETAIL A · 10:1
Seiko 6R55, dial sideDrawing from data, not a photo · mm

6R55 at a glance

Jewels
241
Beat rate
21,600 bph1
Power reserve
72 h1
Accuracy
−15 to +25 s/day1
Do not set the date
21:00–01:001

New to the terms? Read quartz vs automatic or watch movement types.

Setting and servicing the 6R55

The figures a watchmaker or a timegrapher needs for the 6R55, as Seiko prints them.

Accuracy (maker)
−15 to +25 s/day1Only if worn on the wrist in a temperature range of 5 C to 35 C
Power reserve
72 h1
Do not set the date
21:00–01:001
Hacking seconds
Yes1
Hand winding
Yes1

What fits the 6R55

The figures a dial, hands or case must match for the 6R55, as Seiko prints them.

Date window
3H2secondary source

Same family at Seiko

How each differs from the 6R55, worked out from the figures on its own page.

All 6R55 figures

Every figure we hold for the 6R55, with its source. Where sources disagree, each value is shown.

Running

Jewels
241
Beat rate
21,600 bph1
Power reserve
72 h1
Hands and functions
hours, minutes, centre seconds, date1
Hacking seconds
Yes1
Hand winding
Yes1

Accuracy and care

Accuracy (maker)
−15 to +25 s/day1
Do not set the date
21:00–01:001

Fitting: dial, hands, stem

Date window
3H2secondary source

Origin

Made from
20232secondary source

Not published yet

  • Diameter: not in the documents we read
  • Height: not in the documents we read
  • Lift angle: not in the documents we read
  • Hand holes: only in Seiko’s drawing; not read yet
  • Dial feet: only in Seiko’s drawing; not read yet
  • Stem part number: not published by Seiko

Versions

6R55A[2]

6R55 questions

How accurate is the 6R55?

Seiko rates the 6R55 at −15 to +25 s/day, measured under Seiko’s own test conditions; a worn 6R55 can run outside the −15 to +25 s/day range.

Source [1]

How long does the 6R55 run when fully wound?

About 72 h from a full wind, per Seiko.

Source [1][2]

When should you not change the date on the 6R55?

Not between 21:00 and 01:00, per Seiko: the 6R55’s date change is engaged then, so move its hands past 01:00 before using the quick-set.

Source [1]

Does the 6R55 hack and hand-wind?

Yes, it hacks: the seconds hand stops with the crown pulled out. It can be wound by the crown.

Source [1]

More on movements

Sources

Documents checked · Report a wrong number

  1. 1Seiko Watch Corporation — Mechanical watch instructions, Cal. 6R55/6R5J (EN) · pdf · read
  2. 2CaliberCorner — Seiko Caliber 6R55 watch movement page · html · read