Seiko (TMI) NH34 Automatic Movement - GMT Date (White)

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$190 SGD - $240 SGD

The affordable automatic GMT.

Genuine Seiko NH34 automatic movement with a true GMT complication plus date, crown at 3 o'clock, with white date wheel. The NH34 is the only affordably-priced automatic GMT movement Seiko makes, which is why it's the go-to engine for a modded travel watch. It drives a fourth, 24-hour hand for tracking a second time zone.

Two accuracy grades. One genuine Seiko caliber, QC-passed by TMI.
Pick Regulated for watchmaker-tuned precision, or Non-Regulated for Seiko factory spec. Every unit is a genuine Time Module Inc. movement, tested functional before it ships.

A real GMT complication.
An independent 24-hour hand tracks a second time zone. Set the home/reference time on the 24-hour hand and read a second zone off the main hands, or the reverse. The affordable way into a modded GMT build.

Regulated or non-regulated.
Choose Regulated and a certified watchmaker tunes it to 0 to +8 seconds/day before it ships. Choose Non-Regulated for factory-default accuracy of -20 to +40 seconds/day per Seiko's spec. Same movement, your call on precision.

Hacking and hand-winding.
Both built in. The seconds hand stops when you pull the crown for precise time-setting, and you can manually wind it. The popular reason modders upgrade from older 7S26/7S36 calibers.

Ships with a dial washer.
Unique to the NH34: a dial washer comes installed to support the dial and keep it clear of the GMT gear train sitting on top of the movement. If it ever drops out, refit it in a 'U' orientation. Also includes a full-length threaded stem and a dummy stem with plastic crown.

How the NH family compares

Caliber	Complication	Crown Position	Version
NH34 · THIS MOVEMENT	GMT + Date	3 or 4 o'clock	White
NH35	Date	3 or 4 o'clock	Black White
NH35	Date · 6 o'clock dial	3 or 4 o'clock	Black White
NH36	Day + Date	3 o'clock only	Black White
NH36	Day + Date	4 o'clock only	Black White
NH38	Open Heart (no date)	3 or 4 o'clock	View
NH70 / 71 / 72	Skeleton (no date)	3 or 4 o'clock	NH72

Most NH movements fit either a 3 or 4 o'clock crown — the stem threads either way and the date disc isn't affected. The NH36 is the exception: its day wheel is pre-aligned for one crown position, so pick the standard (3 o'clock) or the 4 o'clock version to match your case. Every caliber shares the same 24-jewel automatic platform, 21,600 vph beat rate, and 41+ hour power reserve. Click any version to go straight to that product.

For experienced modders only

Movement swapping is recommended only for individuals with the right skills and experience. Every movement passes Time Module Inc. (TMI) quality control before shipping and is guaranteed fully functional on arrival. Given the DIY nature of modding and Seiko's trade practices, movements cannot be returned once shipped. We are not responsible for damage incurred during fitting.

Specs
Compatibility
What's Included
How To Mod

1. Manufacturer Time Module Inc. (TMI)
2. Caliber NH34A
3. Movement Type Automatic, Mechanical
4. Hand Height Type M
5. Movement Diameter 27.40mm
6. Casing Diameter 29.36mm (with dial holding spacer)
7. Movement Height 5.32mm
8. Jewels 24 jewels
9. Beats Per Hour 21,600 vph (6 vibrations per second)
10. Additional Function 24-Hour (GMT), Date display
11. Hacking Yes
12. Manual Winding Yes
13. Winding Direction Clockwise
14. Power Reserve More than 41 hours
15. Accuracy (Regulated) 0 to +8 seconds/day
16. Accuracy (Non-Regulated) -20 to +40 seconds/day
17. Hands Fitting Size 24H: 2.2mm, H: 1.5mm, M: 0.88mm, S: 0.2mm
Where this movement fits
1. Hand height Type M (standard) — confirm your case accepts Type M before fitting
2. Our cases Pilot 34, 1908 36, 62GS 36 (GMT-ready cases)
3. Dial 28.5mm Seiko Mod dials — match the date aperture to the movement
4. Hands NH-series compatible
The NH34's GMT gear train sits proud of the movement, so it needs cases and dials built to clear it. On our range, the NH34 is supported by the Pilot 34, 1908 36, and 62GS 36 cases. Pair it with a GMT or 24-hour dial to use the complication.
1. 1x NH34 movement (dial washer pre-installed)
2. 1x Full-length threaded stem
3. 1x Dummy stem with plastic crown
All photos showing movements fitted with dials, hands, or cases are for illustration only and are not included with the movement purchase.

Does the NH34 give a true GMT, or just a 24-hour hand?

A true independent GMT. The NH34 drives a fourth, 24-hour hand you can set independently to track a second time zone. It's the only automatic GMT movement Seiko makes at this price, which is why it's the go-to for a modded travel watch.

What is the dial washer on the NH34 for?

The dial washer is unique to the NH34. It supports the dial and keeps it clear of the GMT gear train that sits on top of the movement. It comes pre-installed; if it ever drops out, refit it in a 'U' orientation before seating the dial.

Which cases and dials does the NH34 need?

On our range the NH34 is supported by the Pilot 34, 1908 36, and 62GS 36 cases. Pair it with a GMT or 24-hour dial cut for the NH34's wider 2.7mm centre hole, so the 24-hour pinion passes through and the hand clears.

What's the difference between Regulated and Non-Regulated?

Regulated movements are tuned by a certified watchmaker to 0 to +8 seconds per day before they ship. Non-Regulated movements run at Seiko's factory-default accuracy of -20 to +40 seconds per day. It's the same movement either way — Regulated just buys you tighter timekeeping out of the box.

Is this a Type M or Type L movement, and does it matter?

This is a Type M movement. Type M and Type L are Seiko's two factory hand-fitting heights; Type L sits about 0.4mm taller. Ultra Thin Edition cases have tight hand-to-sapphire clearance, so they take Type M only. Always confirm Type M before fitting.

Can I return a movement if my mod doesn't work out?

Movements can't be returned once shipped. Given the DIY nature of modding and Seiko's trade practices, all movement sales are final. Every unit passes TMI quality control and is guaranteed fully functional on arrival — but the fitting itself is at your own risk, so this movement is recommended for experienced modders only.