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WatchtheDetails

Movement comparison

NH35 vs NH70

no date; same diameter; same height. Can NH70 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 Some fit figures are still unpublished, so this verdict is not confirmed.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 NH70Dial 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 NH70: Ø 27.4, H 5.32, date —, crown — (vs A: Ø 0 H 0 mm).A Ø 27.4B Ø 27.4A 5.32B 5.32SIDE · HEIGHTS ON ONE BASELINEHAND HOLES · 8:1A hour 1.5 · minute 0.88 · second 0.198B hand holes —A TMI NH35Ø 27.4 · H 5.32 · date 3H · crown 3HB TMI NH70Ø 27.4 · H 5.32 · date — · crown —vs A: Ø 0 H 0 mm
NH35 vs NH70 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 NH70 specification comparison
FigureATMI NH35BTMI NH70
Diameter27.4 mm127.4 mm2
Casing diameterdiffers29.36 mm127 mm3
Size in lignes12‴412‴5
Height5.32 mm15.32 mm5
Jewels244245
Beat rate21,600 bph421,600 bph5
Power reserve41 h641 h3
Accuracy (maker)−20 to +40 s/day6−20 to +40 s/day3
Lift angle53°653°3
Hands and functionsdiffershours, minutes, centre seconds, date4hours, minutes, centre seconds5
Hacking secondsYes4Yes5
Hand windingYes6Yes7
Date windowone side only3H6 · 3H, 6H, 9H8not in the documents we read
Do not set the dateone side only21:00–04:009not published
Crownone side only3H6 · 4H10not published
Hand holesone side onlyhour 1.5 · minute 0.88 · second 0.198 mm8only in TMI’s drawing; not read yet
Dial feetone side only1:36, 7:338 · 1:36, 7:338only in TMI’s drawing; not read yet
Dial centre holeone side only2.05 mm8not published

Can NH70 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 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.

Not published, so not checked: hand holes for NH70; crown position for NH70; dial feet for NH70.

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. — TMI Watch Movement Specification and Drawing (Spec Sheet) NH70 · pdf · read
  3. 3Time Module Ltd. — TMI Technical Guide & Parts Catalogue NH70 · pdf · read
  4. 4Time Module Ltd. — Product Line-Up - Mechanical (NH0&NH3); NH34/NH35/NH36 product blocks · html · read
  5. 5Time Module Ltd. — Product Line-Up - Skeleton Mechanical (NH7): NH70/NH71/NH72 blocks · html · read
  6. 6Time Module Ltd. — Technical Guide & Parts Catalogue, Cal.NH3 Series (NH34A/35A/36A/37A/38A/39A) - Automatic Mechanical · pdf · read
  7. 7Time Module Ltd. — TMI Operation Manual NH70 · pdf · read
  8. 8Time 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
  9. 9Time Module Ltd. — Operation Manual, Cal.NH3 Series (NH34A/35A/36A/37A/38A/39A) · pdf · read
  10. 10Lucius Atelier (seller) — Seiko Mod Dial Compatibility Guide: NH34, NH35, NH36 (blog article) · html · read