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Movement · Seiko · automatic

Seiko 4R34 movement

Seiko 4R34 is an automatic movement by Seiko: 27.4 mm1secondary source across, 242 jewels, beating at 21,600 bph2, 41 h2 of power reserve. 5 watches in our base use it: SBSC003, SSK001 (list).

Sources checked · How we source numbers
Seiko 4R34: movement drawingSeiko 4R34, dial side, to scale: movement diameter 27.4 mm; casing diameter 27 mm; date 3H window (size unknown); height — (unknown); hour, minute, second hand hole Ø — (unknown).movement Ø 27.4casing Ø 27date 3Hsize —, position onlyØ 27.4 = 12.15‴height —SIDEAhour, minute, second hand hole Ø —DETAIL A · 10:1
Seiko 4R34, dial sideDrawing from data, not a photo · mm

4R34 at a glance

Diameter
27.4 mm1secondary source
Jewels
242
Beat rate
21,600 bph2
Power reserve
41 h2
Accuracy
−35 to +45 s/day2
Lift angle
53°1secondary source
Do not set the date
21:00–03:002

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

Setting and servicing the 4R34

The figures a watchmaker or a timegrapher needs for the 4R34, as Seiko prints them.

Lift angle
53°1secondary source
Accuracy (maker)
−35 to +45 s/day2Only if worn on the wrist in a temperature range of 5 C to 35 C
Power reserve
41 h2
Do not set the date
21:00–03:002
Hacking seconds
Yes2
Hand winding
Yes2

What fits the 4R34

The figures a dial, hands or case must match for the 4R34, as Seiko prints them.

Casing diameter
27 mm1secondary source
Date window
3H1secondary source

Same family at Seiko

How each differs from the 4R34, worked out from the figures on its own page.

What can replace the 4R34

11 calibres of the Seiko NH / 4R / 7S group checked against the 4R34: diameter, height, hand holes, date window, crown and dial feet. A verdict marked “not confirmed” lacks one of those figures for the 4R34 or the other calibre.

Not published, so not checked in several comparisons:

  • height for 4R34
  • hand holes for 4R34, 4R35, 4R36, 7S36 and NH38
  • crown position for 4R34, 4R35, 4R36, 7S26, 7S36 and NH38
  • dial feet for 4R34, 4R35, 4R36, 7S26, 7S36 and NH38

  1. 4R34 → NH34

    Drop-in· not confirmed
    • =diameterAbout the same diameter (27.4 mm and 12‴; a size in lignes is rounded).
    • =dateDate window at 3H on both.

    Not published, so not checked: a millimetre diameter for NH34.

  2. 4R34 → 4R35

    Fits with changes· not confirmed
    • =diameterSame movement diameter: 27.4 mm.
    • ≠functions4R35 has no 24-hour hand: the dial and hands of 4R34 won’t match.
    • =dateDate window at 3H on both.

  3. 4R34 → NH35

    Fits with changes· not confirmed
    • =diameterSame movement diameter: 27.4 mm.
    • ≠functionsNH35 has no 24-hour hand: the dial and hands of 4R34 won’t match.
    • =dateDate window at 3H on both.

  4. 4R34 → 4R36

    Fits with changes· not confirmed
    • =diameterSame movement diameter: 27.4 mm.
    • ≠functions4R36 has no 24-hour hand: the dial and hands of 4R34 won’t match.
    • ≠date4R36 adds a day wheel: a date-only dial hides it, and the crown gets a day-setting step.
    • =dateDate window at 3H on both.

  5. 4R34 → 7S26

    Fits with changes· not confirmed
    • =diameterSame movement diameter: 27.4 mm.
    • ≠functions7S26 has no 24-hour hand: the dial and hands of 4R34 won’t match.
    • ≠date7S26 adds a day wheel: a date-only dial hides it, and the crown gets a day-setting step.
    • =dateDate window at 3H on both.

  6. 4R34 → 7S36

    Fits with changes· not confirmed
    • =diameter7S36’s movement diameter matches 4R34’s casing diameter: 27 mm.
    • ≠functions7S36 has no 24-hour hand: the dial and hands of 4R34 won’t match.
    • ≠date7S36 adds a day wheel: a date-only dial hides it, and the crown gets a day-setting step.

    Not published, so not checked: date position for 7S36.

  7. 4R34 → NH36

    Fits with changes· not confirmed
    • =diameterSame movement diameter: 27.4 mm.
    • ≠functionsNH36 has no 24-hour hand: the dial and hands of 4R34 won’t match.
    • ≠dateNH36 adds a day wheel: a date-only dial hides it, and the crown gets a day-setting step.
    • =dateDate window at 3H on both.

  8. 4R34 → NH38

    Fits with changes· not confirmed
    • =diameterSame movement diameter: 27.4 mm.
    • ≠functionsNH38 has no 24-hour hand: the dial and hands of 4R34 won’t match.
    • ≠dateNH38 has no date: a dial with a date window would show nothing in it.

3 more calibres in the group fit less well; compare any of them with the movement comparison.

Watches with the 4R34

All 4R34 figures

Every figure we hold for the 4R34, with its source. Where sources disagree, each value is shown.

Size

Diameter
27.4 mm1secondary source
Casing diameter
27 mm1secondary source

Running

Jewels
242
Beat rate
21,600 bph2
Power reserve
41 h2
Hands and functions
hours, minutes, centre seconds, 24-hour hand, date2
Hacking seconds
Yes2
Hand winding
Yes2

Accuracy and care

Accuracy (maker)
−35 to +45 s/day2
Lift angle
53°1secondary source
Do not set the date
21:00–03:002

Fitting: dial, hands, stem

Date window
3H1secondary source

Origin

Made in
Japan1secondary source

Not published yet

  • Diameter: not published
  • Height: not in the documents we read
  • Lift angle: not published
  • 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

4R34 questions

What is the lift angle of the 4R34?

53°, as Seiko prints it. Enter 53° on a timegrapher to read amplitude correctly for the 4R34.

Source [1]

How accurate is the 4R34?

Seiko rates the 4R34 at −35 to +45 s/day, measured under Seiko’s own test conditions; a worn 4R34 can run outside the −35 to +45 s/day range.

Source [2]

How long does the 4R34 run when fully wound?

About 41 h from a full wind, per Seiko.

Source [2][1]

When should you not change the date on the 4R34?

Not between 21:00 and 03:00, per Seiko: the 4R34’s date change is engaged then, so move its hands past 03:00 before using the quick-set.

Source [2]

Does the 4R34 hack and hand-wind?

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

Source [2]

What can replace the 4R34?

From the published figures, the closest is the NH34: drop-in, not confirmed for every part. About the same diameter (27.4 mm and 12‴; a size in lignes is rounded).

More on movements

Sources

Documents checked · Report a wrong number

  1. 1CaliberCorner — Seiko Caliber 4R34 watch movement page · html · read
  2. 2Seiko Watch Corporation — Mechanical watch instructions, Cal. 4R34 (EN) · pdf · read
  3. 3Seiko Watch Corporation — SBSC003 product page (5 Sports), seikowatches.com jp-ja · html · read
  4. 4Seiko Watch Corporation — SSK001 product page (us-en), seikowatches.com · html · read
  5. 5Seiko Watch Corporation — SSK003 product page (us-en), seikowatches.com · html · read
  6. 6Seiko Watch Corporation — SSK005 product page (5 Sports), seikowatches.com US · html · read
  7. 7Seiko Watch Corporation — SSK059 product page (5 Sports), seikowatches.com us-en · html · read