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Movement comparison

NH35 vs NH34

adds 24-hour hand; same diameter; same height; same hand holes. Can NH34 replace NH35? Only with changes to the watch or parts. Some fit figures are still unpublished, so this verdict is not confirmed.

Sources checked · How we source numbers
Movements to scale: TMI NH35, TMI NH34Dial side and side section at one scale, hand holes enlarged 8:1. A TMI NH35: Ø 27.4, H 5.32, date 3H, crown 3H. B TMI NH34: Ø ≈27.07, H 5.32, date 3H, crown 3H (vs A: Ø −0.33 H 0 mm).B Ø ≈27.07A Ø 27.4A 5.32B 5.32SIDE · HEIGHTS ON ONE BASELINEHAND HOLES · 8:1A hour 1.5 · minute 0.88 · second 0.198B hour 1.5 · minute 0.88 · second 0.198A TMI NH35Ø 27.4 · H 5.32 · date 3H · crown 3HB TMI NH34Ø ≈27.07 · H 5.32 · date 3H · crown 3Hvs A: Ø −0.33 H 0 mm
NH35 vs NH34 to one scaleDrawing from data, not a photo · mm

Published figures

Differences are highlighted. Each number links to its source; an empty field says what is missing.

NH35 vs NH34 specification comparison
FigureATMI NH35BTMI NH34
Diameterone side only27.4 mm1only in TMI’s drawing; not read yet
Casing diameterone side only29.36 mm1only in TMI’s drawing; not read yet
Size in lignes12‴212‴2
Height5.32 mm15.32 mm4
Jewels242242
Beat rate21,600 bph221,600 bph2
Power reserveone side only41 h3not published by TMI
Accuracy (maker)one side only−20 to +40 s/day3not published by TMI
Lift angleone side only53°3not published by TMI
Hands and functionsdiffershours, minutes, centre seconds, date2hours, minutes, centre seconds, date, 24-hour hand2
Hacking secondsYes2Yes2
Hand windingYes3Yes3
Date window3H3 · 3H, 6H, 9H53H3 · 3H, 6H6
Do not set the date21:00–04:00721:00–04:007
Crown3H3 · 4H83H3 · 4H8
Hand holesdiffershour 1.5 · minute 0.88 · second 0.198 mm5hour 1.5 · minute 0.88 · second 0.198 · gmt 2.2 mm6
Dial feet1:36, 7:335 · 1:36, 7:3351:36, 7:336 · 1:36, 7:336
Dial centre holediffers2.05 mm52.88 mm6
2 sources disagree; show every value
  • manufacturer 2.88 mm6
  • seller listing 2.7 mm8

Can NH34 replace NH35?

The direction matters: this checks a watch built for the first calibre with the second installed. Size alone does not prove that hands, dial, stem and case will fit.

Fits with changes· not confirmed
  • =diameterSame size in lignes: 12‴.
  • =heightSame height: 5.32 mm.
  • =handsSame hand holes (hour 1.5, minute 0.88, second 0.198 mm): the hands carry over.
  • ≠functionsNH34 adds a 24-hour hand: it needs a dial and hand set made for it.
  • =dateDate window at 3H, same distance from the centre (10.55 mm).
  • =crownCrown at 3H on both.
  • =dial feetDial feet in the same places (1:36, 7:33).

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

Check the actual case, stem height and parts before ordering. Compare another pair.

Sources

Documents checked · Report a wrong number

  1. 1Time Module Ltd. — Watch Movement Specification and Drawing - Standard Mechanical Movement NH35A · pdf · read
  2. 2Time Module Ltd. — Product Line-Up - Mechanical (NH0&NH3); NH34/NH35/NH36 product blocks · html · read
  3. 3Time Module Ltd. — Technical Guide & Parts Catalogue, Cal.NH3 Series (NH34A/35A/36A/37A/38A/39A) - Automatic Mechanical · pdf · read
  4. 4Time Module Ltd. — Watch Movement Specification and Drawing - Standard Mechanical Movement NH34A · pdf · read
  5. 5Time Module Ltd. — Watch Movement Specification and Drawing - NH35A (drawing pages read: Appearance-1, Hand Fitting, Hand Setting Stem, Dial-1, Dial-2, Hands) · pdf · read
  6. 6Time Module Ltd. — Watch Movement Specification and Drawing - NH34A (drawing pages read: Dial, Hand Fitting, Hands, Hand Setting Stem) · pdf · read
  7. 7Time Module Ltd. — Operation Manual, Cal.NH3 Series (NH34A/35A/36A/37A/38A/39A) · pdf · read
  8. 8Lucius Atelier (seller) — Seiko Mod Dial Compatibility Guide: NH34, NH35, NH36 (blog article) · html · read