Skip to content
WatchtheDetails

Movement · Seiko · automatic

Seiko 6R15 movement

Seiko 6R15 is an automatic movement by Seiko: 27.4 mm1secondary source across, 5.32 mm1secondary source Sources disagree: secondary source 5.32 mm / secondary source 5.25 mm2 high, 233 Sources disagree: manufacturer 23 / secondary source 23/242 jewels, beating at 21,600 bph3, 50 h4 of power reserve. 2 watches in our base use it: SARB017, SARX055 (list).

Sources checked · How we source numbers
Seiko 6R15: movement drawingSeiko 6R15, dial side, to scale: movement diameter 27.4 mm; casing diameter 27 mm; date 3H window (size unknown); height 5.32 mm; hour, minute, second hand hole Ø — (unknown).movement Ø 27.4casing Ø 27date 3Hsize —, position onlyØ 27.4 = 12.15‴5.32SIDE · SECTION · height 5.32Ahour, minute, second hand hole Ø —DETAIL A · 10:1
Seiko 6R15, dial sideDrawing from data, not a photo · mm

6R15 at a glance

Diameter
27.4 mm1secondary source
Height
5.32 mm1secondary source
2 sources disagree; show every value
  • secondary source 5.32 mm1
  • secondary source 5.25 mm2
Jewels
233
2 sources disagree; show every value
  • manufacturer 233
  • secondary source 23/242
Beat rate
21,600 bph3
Power reserve
50 h4
Accuracy
−15 to +25 s/day3
Do not set the date
22:00–01:003

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

Setting and servicing the 6R15

The figures a watchmaker or a timegrapher needs for the 6R15, as Seiko prints them.

Accuracy (maker)
−15 to +25 s/day3
Power reserve
50 h4
Do not set the date
22:00–01:003
Hacking seconds
Yes4
Hand winding
Yes3

Watches with the 6R15

What fits the 6R15

The figures a dial, hands or case must match for the 6R15, as Seiko prints them.

Casing diameter
27 mm2secondary source
Date window
3H2secondary source
  • The 6R15 is based on the 7S26[1](secondary source).

Same family at Seiko

How each differs from the 6R15, worked out from the figures on its own page.

All 6R15 figures

Every figure we hold for the 6R15, with its source. Where sources disagree, each value is shown.

Size

Diameter
27.4 mm1secondary source
Casing diameter
27 mm2secondary source
Height
5.32 mm1secondary source
2 sources disagree; show every value
  • secondary source 5.32 mm1
  • secondary source 5.25 mm2

Running

Jewels
233
2 sources disagree; show every value
  • manufacturer 233
  • secondary source 23/242
Beat rate
21,600 bph3
Power reserve
50 h4
Hands and functions
hours, minutes, centre seconds, date3
Hacking seconds
Yes4
Hand winding
Yes3

Accuracy and care

Accuracy (maker)
−15 to +25 s/day3
Do not set the date
22:00–01:003

Fitting: dial, hands, stem

Date window
3H2secondary source

Origin

Made from
20061secondary source

Not published yet

  • Diameter: not published
  • Height: not published
  • 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

6R15A · 6R15B · 6R15C[2]

6R15 questions

How accurate is the 6R15?

Seiko rates the 6R15 at −15 to +25 s/day, measured under Seiko’s own test conditions; a worn 6R15 can run outside the −15 to +25 s/day range.

Source [3]

Which watches use the 6R15?

2 watches in our base name the 6R15: SARB017, SARX055.

How long does the 6R15 run when fully wound?

About 50 h from a full wind, per Seiko.

Source [4]

When should you not change the date on the 6R15?

Not between 22:00 and 01:00, per Seiko: the 6R15’s date change is engaged then, so move its hands past 01:00 before using the quick-set.

Source [3]

Does the 6R15 hack and hand-wind?

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

Source [4][3]

What dial, hands and case fit the 6R15?

Seiko lists casing diameter 27 mm; date window 3H. A dial, a set of hands or a case fits the 6R15 when it matches these figures.

Source [2]

More on movements

Sources

Documents checked · Report a wrong number

  1. 1Grail Watch — Grail Watch Wiki: Seiko 6R15 · html · read
  2. 2CaliberCorner — Seiko Caliber 6R15 watch movement page · html · read
  3. 3Seiko Watch Corporation — Automatic Diver's Watch instructions, Cal. 6R15 (EN pages) · pdf · read
  4. 4Seiko Watch Corporation — Automatic Watch instructions, Cal. 6R15 (EN pages) · pdf · read
  5. 5WatchBase — Seiko SARB017, Mechanical Alpinist Stainless Steel / Green / Strap (WatchBase) · html · read
  6. 6Worn & Wound — Seiko Presage SARX055 (aka Baby Snowflake) - Worn & Wound · html · read