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Movement · TMI (Seiko Instruments) · automatic

TMI NH34 movement

TMI NH34 is an automatic movement by TMI (Seiko Instruments): 12‴1 in size, 5.32 mm2 high, 241 jewels, beating at 21,600 bph1. 3 watches in our base use it (list).

Sources checked · How we source numbers
TMI NH34: movement drawingTMI NH34, dial side, to scale: movement diameter — (unknown); stem at 3H; date 3H window 2.9 × 2 mm, centre 10.55 mm from the axis; dial foot F1 at x 9.67 mm, y 8.67 mm (about 1:36); dial foot F2 at x −9.47 mm, y −8.93 mm (about 7:33); size 12‴; height 5.32 mm; GMT hand hole Ø 2.2 mm; hour hand hole Ø 1.5 mm; minute hand hole Ø 0.88 mm; second hand hole Ø 0.198 mm; dial centre hole Ø 2.88 mm.movement Ø —10.55stem 3Hdate 3H 2.9 × 2centre 10.55 from axisF1 1:36x 9.67 y 8.67F2 7:33x −9.47 y −8.9312‴ as printed5.32SIDE · SECTION · height 5.32Adial hole Ø 2.88GMT Ø 2.2hour Ø 1.5minute Ø 0.88second Ø 0.198DETAIL A · 4:1
TMI NH34, dial sideDrawing from data, not a photo · mm

NH34 at a glance

Diameter
12‴1
Height
5.32 mm2
Jewels
241
Beat rate
21,600 bph1
Do not set the date
21:00–04:003

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

Watches with the NH34

What fits the NH34

The figures a dial, hands or case must match for the NH34, as TMI prints them.

Hand holes
hour 1.5 · minute 0.88 · second 0.198 · gmt 2.2 mm6
Hand height options
type M: H1 24h wheel 0.6 · H2 hour wheel 0.818 · H3 cannon pinion 0.61 · H4 fourth wheel 0.42 mm6
Dial feet
1:36, 7:336 · 1:36, 7:336
Dial centre hole
2.88 mm6
2 sources disagree; show every value
  • manufacturer 2.88 mm6
  • seller listing 2.7 mm4
Date window
3H5 · 3H, 6H6
Crown
3H5
Stem length
A 11 · B 21.48 mm6
Stem part number
0351 2006

What can replace the NH34

11 calibres of the Seiko NH / 4R / 7S group checked against the NH34: diameter, height, hand holes, date window, crown and dial feet. A verdict marked “not confirmed” lacks one of those figures for the NH34 or the other calibre.

Not published, so not checked in several comparisons:

  • a millimetre diameter for NH34
  • hand holes for 4R34, 4R35, 4R36, NH38, NH39 and NH70
  • crown position for 4R34, 4R35, 4R36, NH38, NH39 and NH70
  • dial feet for 4R34, 4R35, 4R36, NH38, NH39 and NH70

  1. NH34 → 4R34

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

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

  2. NH34 → 4R35

    Fits with changes· not confirmed
    • =diameterAbout the same diameter (12‴ and 27.4 mm; a size in lignes is rounded).
    • =heightSame height: 5.32 mm.
    • ≠functions4R35 has no 24-hour hand: the dial and hands of NH34 won’t match.
    • =dateDate window at 3H on both.

  3. NH34 → NH35

    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.
    • ≠functionsNH35 has no 24-hour hand: the dial and hands of NH34 won’t match.
    • =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).

  4. NH34 → 4R36

    Fits with changes· not confirmed
    • =diameterAbout the same diameter (12‴ and 27.4 mm; a size in lignes is rounded).
    • =heightSame height: 5.32 mm.
    • ≠functions4R36 has no 24-hour hand: the dial and hands of NH34 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. NH34 → NH36

    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.
    • ≠functionsNH36 has no 24-hour hand: the dial and hands of NH34 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.
    • =crownCrown at 3H on both.
    • =dial feetDial feet in the same places (1:36, 7:33).

  6. NH34 → NH38

    Fits with changes· not confirmed
    • =diameterSame size in lignes: 12‴.
    • =heightSame height: 5.32 mm.
    • ≠functionsNH38 has no 24-hour hand: the dial and hands of NH34 won’t match.
    • ≠dateNH38 has no date: a dial with a date window would show nothing in it.

  7. NH34 → NH39

    Fits with changes· not confirmed
    • =diameterSame size in lignes: 12‴.
    • =heightSame height: 5.32 mm.
    • ≠functionsNH39 has no 24-hour hand: the dial and hands of NH34 won’t match.
    • ≠dateNH39 has no date: a dial with a date window would show nothing in it.

  8. NH34 → NH70

    Fits with changes· not confirmed
    • =diameterSame size in lignes: 12‴.
    • =heightSame height: 5.32 mm.
    • ≠functionsNH70 has no 24-hour hand: the dial and hands of NH34 won’t match.
    • ≠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.

Setting and servicing the NH34

The figures a watchmaker or a timegrapher needs for the NH34, as TMI prints them.

Do not set the date
21:00–04:003
Hacking seconds
Yes1
Hand winding
Yes5

Same family at TMI

How each differs from the NH34, worked out from the figures on its own page.

All NH34 figures

Every figure we hold for the NH34, with its source. Where sources disagree, each value is shown.

Size

Size in lignes
12‴1
Height
5.32 mm2
Installed height
7.99 mm4seller listing

Running

Jewels
241
Beat rate
21,600 bph1
Hands and functions
hours, minutes, centre seconds, date, 24-hour hand1
Hacking seconds
Yes1
Hand winding
Yes5

Accuracy and care

Do not set the date
21:00–04:003

Fitting: dial, hands, stem

Date window
3H5 · 3H, 6H6
Crown
3H5
Hand holes
hour 1.5 · minute 0.88 · second 0.198 · gmt 2.2 mm6
Hand height options
type M: H1 24h wheel 0.6 · H2 hour wheel 0.818 · H3 cannon pinion 0.61 · H4 fourth wheel 0.42 mm6
Dial feet
1:36, 7:336 · 1:36, 7:336
Dial centre hole
2.88 mm6
2 sources disagree; show every value
  • manufacturer 2.88 mm6
  • seller listing 2.7 mm4
Stem part number
0351 2006
Stem length
A 11 · B 21.48 mm6

Origin

Made in
Japan or Malaysia1

Not published yet

  • Power reserve: not published by TMI
  • Accuracy (maker): not published by TMI
  • Lift angle: not published by TMI

Versions

NH34A11J · NH34A11MN · NH34A11JB · NH34A11MNB · NH34A12MNB[10]

NH34 questions

Which watches use the NH34?

3 watches in our base name the NH34: 1963 Pilot Watch GMT Automatic, Bradner GMT Automatic Orange Blue, Fleuss GMT Automatic Midnight Wave.

What dial, hands and case fit the NH34?

TMI lists hand holes hour 1.5 · minute 0.88 · second 0.198 · gmt 2.2 mm; hand height options type M: H1 24h wheel 0.6 · H2 hour wheel 0.818 · H3 cannon pinion 0.61 · H4 fourth wheel 0.42 mm; dial feet 1:36, 7:33; dial centre hole 2.88 mm · 2.7 mm; date window 3H · 3H, 6H; crown 3H. A dial, a set of hands or a case fits the NH34 when it matches these figures.

Source [6][4][5]

When should you not change the date on the NH34?

Not between 21:00 and 04:00, per TMI: the NH34’s date change is engaged then, so move its hands past 04:00 before using the quick-set.

Source [3]

Does the NH34 hack and hand-wind?

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

Source [1][5]

What can replace the NH34?

From the published figures, the closest is the 4R34: drop-in, not confirmed for every part. About the same diameter (12‴ and 27.4 mm; a size in lignes is rounded).

More on movements

Sources

Documents checked · Report a wrong number

  1. 1Time Module Ltd. — Product Line-Up - Mechanical (NH0&NH3); NH34/NH35/NH36 product blocks · html · read
  2. 2Time Module Ltd. — Watch Movement Specification and Drawing - Standard Mechanical Movement NH34A · pdf · read
  3. 3Time Module Ltd. — Operation Manual, Cal.NH3 Series (NH34A/35A/36A/37A/38A/39A) · pdf · read
  4. 4Lucius Atelier (seller) — Seiko Mod Dial Compatibility Guide: NH34, NH35, NH36 (blog article) · html · read
  5. 5Time Module Ltd. — Technical Guide & Parts Catalogue, Cal.NH3 Series (NH34A/35A/36A/37A/38A/39A) - Automatic Mechanical · 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. 7Dan Henry Watches — 1963 Pilot Watch | Dan Henry Vintage Watches · html · read
  8. 8Spinnaker Watches — Orange Blue | Bradner GMT Automatic · html · read
  9. 9Spinnaker Watches — Midnight Wave | Fleuss GMT Automatic · html · read