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

Genuine SEIKO NH34 Movement with GMT function and date function at 3 o'clock crown position with white wheels.

The BEST and MOST POPULAR choice for modding a GMT customised timepiece given this is the only automatic mechanical movement with GMT function priced affordably by SEIKO.

With two available options:

    Hugely improved on the accuracy! These are regulated by certified watchmakers from 0 to +8 seconds per day.
    Fresh out of the factory defaults without any regulation. Accuracy are in accordance to SEIKO's specification of -20 to +40 seconds per day.
This movement comes with one dial washerone dummy stem with plastic crown and one full length threaded stem. Additional full length threaded stems are available separately.

**Important: Dial washer is unique only to NH34 movement. It is designed to support the dial and prevent the dial from coming in contact with the GMT gears on top of NH34 movement. Dial washer comes installed on the NH34 movement. In case you accidentally drop out the dial washer, ensure that the dial washer is in a 'u' direction when inserting it back.

IMPORTANT: Movement upgrade is ONLY recommended for individuals with the right skillsets and experience. Lucius Atelier is not responsible for any damage to the movement during the fitting process. All movements passed Time Module Inc. (TMI) QC prior to shipping are guaranteed to be a fully functional movement. Given the high degree of DIY nature and Seiko's trade practices, unfortunately, we are unable to accept any returns.

Made by Time Module Inc. (TMI)


    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. Addition 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. Hands Fitting Size 24H: 2.2mm, H:1.5mm, M:0.88mm, S:0.2mm
    1. Movement x1
    2. Full length threaded stem x1
    3. Dial Washer x1
    4. Dummy stem & plastic crown x1

Customer Reviews

Based on 7 reviews
René K. (Nieuwaal, NL)
Using this mod part for: Hommage to a GS elegance.
Great movement.

For a new GMT build I purchased this regulated NH34 movement.

Michael (Perth, AU)
Using this mod part for: AP oak, with a difference
New build in the process

Parts arrived super fast !!.
High quality, and exactly as described….I will be a returning customer

AllTheTimeMods (London, GB)
Using this mod part for: Aftermarket
Runs brilliantly and well within reg.

Not much to say about it. Runs well and functions correctly, gained around +4 seconds in a day well within the regulation so I'm overall very happy
ATTTW5 - 5% off (Not including Seiko Movements, Bergeon tools & Watchmaking Kits)
Check the insta (now allthetimemods) for more, thank you

Nick (Melbourne, US)
Regulated NH34

Great movement and easy to use! Only gained 12 seconds in the past 5 days with the regulated movement.

Stevie (Woking, GB)
Using this mod part for: SKX Aftermarket case

Movement is perfect and with a slight adjustments to a nh35 dial fits perfectly

Wilfried D. (Lieusaint, FR)
Using this mod part for: After marker mm200 case

Perfect !!

O. (Singapore, SG)
Using this mod part for: SKX007 3 O'clock
New GMT movement at a great price

Got the non-regulated one, but was easy enough to regulate myself, and could mod the date wheel easily too!