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Movement · Seiko · automatic

Seiko 4R35 movement

Seiko 4R35 is an automatic movement by Seiko: 27.4 mm1secondary source across, 5.32 mm1secondary source high, 232 Sources disagree: manufacturer 23 / secondary source 23, 241 jewels, beating at 21,600 bph2, 41 h2 Sources disagree: manufacturer 41 h / secondary source 40, 41 h1 of power reserve. 27 watches in our base use it: SRPB41, SRPB43 (list).

Sources checked · How we source numbers
Seiko 4R35: movement drawingSeiko 4R35, dial side, to scale: movement diameter 27.4 mm; date 3H window (size unknown); height 5.32 mm; hour, minute, second hand hole Ø — (unknown).movement Ø 27.4date 3Hsize —, position onlyØ 27.4 = 12.15‴5.32SIDE · SECTION · height 5.32Ahour, minute, second hand hole Ø —DETAIL A · 10:1
Seiko 4R35, dial sideDrawing from data, not a photo · mm

4R35 at a glance

Diameter
27.4 mm1secondary source
Height
5.32 mm1secondary source
Jewels
232
2 sources disagree; show every value
  • manufacturer 232
  • secondary source 23, 241
Beat rate
21,600 bph2
Power reserve
41 h2
2 sources disagree; show every value
  • manufacturer 41 h2
  • secondary source 40, 41 h1
Accuracy
−35 to +45 s/day3
Do not set the date
21:00–01:002

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

Setting and servicing the 4R35

The figures a watchmaker or a timegrapher needs for the 4R35, as Seiko prints them.

Accuracy (maker)
−35 to +45 s/day3only if worn on the wrist in a temperature range of 5°C to 35°C; actual rate may differ with wear, temperature, arm movement, winding state
Power reserve
41 h2
2 sources disagree; show every value
  • manufacturer 41 h2
  • secondary source 40, 41 h1
Do not set the date
21:00–01:002
Hacking seconds
Yes2
Hand winding
Yes2
Rotor winds
Bi-Directional Automatic Winding1secondary source

Watches with the 4R35

What fits the 4R35

The figures a dial, hands or case must match for the 4R35, as Seiko prints them.

Date window
3H1secondary source
  • The 4R35 is the same base calibre as the NH35, sold under another name; Seiko’s own-brand version differs in jewels (23 on the 4R35, 24 on the NH35) and rated accuracy (−35 to +45 s/day on the 4R35, −20 to +40 s/day on the NH35)[1](secondary source).

Same family at Seiko

How each differs from the 4R35, worked out from the figures on its own page.

What can replace the 4R35

11 calibres of the Seiko NH / 4R / 7S group checked against the 4R35: diameter, height, hand holes, date window, crown and dial feet. A verdict marked “not confirmed” lacks one of those figures for the 4R35 or the other calibre.

Not published, so not checked in several comparisons:

  • hand holes for 4R35, 4R34, 4R36, NH38, NH39 and NH70
  • crown position for 4R35, 4R34, 4R36, NH38, NH39 and NH70
  • dial feet for 4R35, 4R34, 4R36, NH38, NH39 and NH70

  1. 4R35 → NH35

    Drop-in· not confirmed
    • =diameterSame movement diameter: 27.4 mm.
    • =heightSame height: 5.32 mm.
    • =dateDate window at 3H on both.

  2. 4R35 → 4R34

    Fits with changes· not confirmed
    • =diameterSame movement diameter: 27.4 mm.
    • ≠functions4R34 adds a 24-hour hand: it needs a dial and hand set made for it.
    • =dateDate window at 3H on both.

    Not published, so not checked: height for 4R34.

  3. 4R35 → 4R36

    Fits with changes· not confirmed
    • =diameterSame movement diameter: 27.4 mm.
    • =heightSame height: 5.32 mm.
    • ≠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.

  4. 4R35 → NH34

    Fits with changes· not confirmed
    • =diameterAbout the same diameter (27.4 mm and 12‴; a size in lignes is rounded).
    • =heightSame height: 5.32 mm.
    • ≠functionsNH34 adds a 24-hour hand: it needs a dial and hand set made for it.
    • =dateDate window at 3H on both.

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

  5. 4R35 → NH36

    Fits with changes· not confirmed
    • =diameterSame movement diameter: 27.4 mm.
    • =heightSame height: 5.32 mm.
    • ≠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.

  6. 4R35 → NH38

    Fits with changes· not confirmed
    • =diameterSame movement diameter: 27.4 mm.
    • =heightSame height: 5.32 mm.
    • ≠dateNH38 has no date: a dial with a date window would show nothing in it.

  7. 4R35 → NH39

    Fits with changes· not confirmed
    • =diameterSame movement diameter: 27.4 mm.
    • =heightSame height: 5.32 mm.
    • ≠dateNH39 has no date: a dial with a date window would show nothing in it.

  8. 4R35 → NH70

    Fits with changes· not confirmed
    • =diameterSame movement diameter: 27.4 mm.
    • =heightSame height: 5.32 mm.
    • ≠dateNH70 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.

All 4R35 figures

Every figure we hold for the 4R35, with its source. Where sources disagree, each value is shown.

Size

Diameter
27.4 mm1secondary source
Height
5.32 mm1secondary source

Running

Jewels
232
2 sources disagree; show every value
  • manufacturer 232
  • secondary source 23, 241
Beat rate
21,600 bph2
Power reserve
41 h2
2 sources disagree; show every value
  • manufacturer 41 h2
  • secondary source 40, 41 h1
Hands and functions
hours, minutes, centre seconds, date2
Hacking seconds
Yes2
Hand winding
Yes2
Rotor winds
Bi-Directional Automatic Winding1secondary source

Accuracy and care

Accuracy (maker)
−35 to +45 s/day3
Do not set the date
21:00–01:002

Fitting: dial, hands, stem

Date window
3H1secondary source

Origin

Made from
20101secondary source

Not published yet

  • Diameter: not published
  • Height: not published
  • Lift angle: not in the documents we read
  • Hand holes: not published by Seiko
  • Dial feet: not in the documents we read
  • Stem part number: not in the documents we read

Versions

4R35A

4R35 questions

How accurate is the 4R35?

Seiko rates the 4R35 at −35 to +45 s/day, measured under Seiko’s own test conditions; a worn 4R35 can run outside the −35 to +45 s/day range.

Source [3][4]

Which watches use the 4R35?

27 watches in our base name the 4R35: SRPB41, SRPB43, SRPB46, SRPB49, SRPB51, SRPB77 and 21 more.

How long does the 4R35 run when fully wound?

About 41 h from a full wind, per Seiko.

Source [2][3][1]

When should you not change the date on the 4R35?

Not between 21:00 and 01:00, per Seiko: the 4R35’s date change is engaged then, so move its hands past 01:00 before using the quick-set.

Source [2][3]

Does the 4R35 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][1][3]

Is the 4R35 the same as the NH35?

Sources describe the 4R35 and NH35 as the same base calibre sold under two names; Seiko’s own-brand version differs in jewels (23 on the 4R35, 24 on the NH35) and rated accuracy (−35 to +45 s/day on the 4R35, −20 to +40 s/day on the NH35). The 4R35 page shows Seiko’s own figures; the NH35 page shows TMI’s.

More on movements

Sources

Documents checked · Report a wrong number

  1. 1Grail Watch — Grail Watch Reference: Seiko Cal. 4R35 · html · read
  2. 2Seiko Watch Corporation — Instructions: Seiko Automatic Diver's Watch Cal. 4R15/4R16/4R35/4R36/7S26/7S35/7S36 (English) · pdf · read
  3. 3Seiko Watch Corporation — Instructions: Diver's Watch for Air Diving, Cal. 4R35 / 4R36 (English) · pdf · read
  4. 4Seiko Watch Corporation — Instructions: Mechanical watch, Cal. 4R35 / 4R36 / 4R37 / 4R38 / 4R71 / 4R72 / 4R39 (English) · pdf · read
  5. 5Seiko Watch Corporation — SRPB41 product page (us-en), seikowatches.com · html · read
  6. 6Seiko Watch Corporation — SRPB43 product page (us-en), seikowatches.com · html · read
  7. 7Seiko Watch Corporation — SRPB46J1 product page (Presage), seikowatches.com US · html · read
  8. 8Right Time International — SRPB49 listing, Right Time (Denver), dealer spec block (pre-owned listing, sold out 2/2021) · html · read
  9. 9Seiko Watch Corporation — SRPB51 product page (Prospex), seikowatches.com ph-en · html · read
  10. 10Right Time International — SRPB77 listing, Right Time (Denver) - authorised dealer, retailer spec block · html · read
  11. 11The Seiko Guy — Seiko Mini Turtle: History, References and Collector's Guide · html · read
  12. 12Seiko Watch Corporation — SRPD23 product page (Prospex), seikowatches.com global-en · html · read
  13. 13Seiko Watch Corporation — SRPD37J1 product page (Presage), seikowatches.com US · html · read
  14. 14Seiko Watch Corporation — SRPD97J1 product page (Presage), seikowatches.com global-en · html · read
  15. 15Seiko Watch Corporation — SRPE15J1 product page (Presage), seikowatches.com US · html · read
  16. 16Right Time International — SRPE17 listing, Right Time (Denver), dealer spec block · html · read
  17. 17Seiko Watch Corporation — SRPE19J1 product page (Presage), seikowatches.com global-en (US page 404) · html · read
  18. 18Seiko Watch Corporation — SRPE33 product page (Prospex), seikowatches.com us-en · html · read