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Movement comparison

NH35 vs Miyota 9015

1.42 mm thinner. Can Miyota 9015 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 Some fit figures are still unpublished, so this verdict is not confirmed.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, Miyota 9015Dial 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 Miyota 9015: Ø ≈25.6, H 3.9, date 3H, crown 3H (vs A: Ø −1.8 H −1.42 mm).B Ø ≈25.6A Ø 27.4B 3.9A 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 Miyota 9015Ø ≈25.6 · H 3.9 · date 3H · crown 3Hvs A: Ø −1.8 H −1.42 mm
NH35 vs Miyota 9015 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 Miyota 9015 specification comparison
FigureATMI NH35BMiyota 9015
Diameterone side only27.4 mm1not published by Miyota
Casing diameterdiffers29.36 mm125.6 mm2
Size in lignesdiffers12‴311½’’’‴4
2 sources disagree; show every value
  • manufacturer 11½’’’‴4
  • manufacturer 11½‴5
Heightdiffers5.32 mm13.9 mm4
Jewels243244
Beat ratediffers21,600 bph328,800 bph4
Power reservediffers41 h642 h4
Accuracy (maker)differs−20 to +40 s/day6−10 to +30 s/day4
Lift anglediffers53°651°7
Hands and functionshours, minutes, centre seconds, date3hours, minutes, centre seconds, date4
Hacking secondsYes3Yes4
Hand windingYes6Yes4
Date windowdiffers3H6 · 3H, 6H, 9H83H, 6H4 · 3H2
Do not set the datediffers21:00–04:00920:30–02:007
Crown3H6 · 4H113H4
Hand holesone side onlyhour 1.5 · minute 0.88 · second 0.198 mm8only in Miyota’s drawing; not read yet
Dial feetdiffers1:36, 7:338 · 1:36, 7:3382:33, 8:242 · 2:33, 8:242
Dial centre holediffers2.05 mm82 mm2

Can Miyota 9015 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
  • ≠diameterMiyota 9015 is 3.76 mm narrower (casing diameter 25.6 mm vs 29.36 mm): casing figures differ between makers, so check the case seat before ordering.
  • ≠heightMiyota 9015 is 1.42 mm thinner (3.9 mm vs 5.32 mm): the dial and hands sit lower, so a spacer or a different stem height may be needed.
  • ≠dateDate at 3H on both, but the window centre is 10.2 mm from the axis vs 10.55 mm: a dial cut for one will not line up with the other.
  • =crownCrown at 3H on both.
  • ≠dial feetDial feet at 2:33, 8:24 vs 1:36, 7:33: cut the feet and fix the dial with dots, or use a dial made for Miyota 9015.

Not published, so not checked: hand holes for Miyota 9015.

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. 2Citizen Watch / Miyota — CAL.9015 Drawing (p.1 Frame for Case, p.2 Indications for Dial 9015-20A, p.3 Setting Stem 065-A05) · pdf · read
  3. 3Time Module Ltd. — Product Line-Up - Mechanical (NH0&NH3); NH34/NH35/NH36 product blocks · html · read
  4. 4Citizen Watch Co., Ltd. (MIYOTA) — MIYOTA movement 9015 product page · html · read
  5. 5Citizen Watch Co., Ltd. (MIYOTA) — MIYOTA movement overview (catalogue table, 2 pages) · pdf · read
  6. 6Time Module Ltd. — Technical Guide & Parts Catalogue, Cal.NH3 Series (NH34A/35A/36A/37A/38A/39A) - Automatic Mechanical · pdf · read
  7. 7Citizen Watch Co., Ltd. (MIYOTA) — CAL.9015 Spec. sheet · 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. 10Citizen Watch Co., Ltd. (MIYOTA) — CAL.9015 Instruction manual · pdf · read
  11. 11Lucius Atelier (seller) — Seiko Mod Dial Compatibility Guide: NH34, NH35, NH36 (blog article) · html · read