Seiko (TMI) NH72 Automatic Movement - Skeleton Ruthenium Grey

Name: Seiko (TMI) NH72 Automatic Movement - Skeleton Ruthenium Grey
Brand: SEIKO
SKU: NH72 Reg.
Price: 128.0 SGD
Availability: OutOfStock

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$98 SGD - $128 SGD

The full skeleton, dial-side.

Genuine Seiko NH72 automatic movement: a full skeleton display in ruthenium grey with a Côtes de Genève decorated rotor. Built for an open, skeletonised view of the entire movement from the watch face, the bridges, gear train, and decorated rotor all on show. The choice when the movement itself is the dial.

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.

The movement is the dial.
A fully skeletonised top plate gives a complete view of the gear train and decorated rotor from the front. No separate dial design competes with it, the mechanism is the aesthetic.

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.

Spacer fitted, ready to seat.
Ships with a dial holding spacer already fitted for straightforward installation, plus a full-length threaded stem and a dummy stem with plastic crown.

How the NH family compares

Caliber	Complication	Crown Position	Version
NH34	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 · THIS MOVEMENT	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 NH72A
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 Skeleton display (no date)
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 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 Skeleton-ready cases (spacer-fitted)
3. Dial 28.5mm Seiko Mod dials — no-date / open dials
4. Hands NH-series compatible
The NH72 is a skeleton movement meant to be seen, pair it with a skeleton or open dial and ideally a display caseback so it's visible front and back. Ships spacer-fitted for easy seating.
1. 1x NH72 movement (dial holding spacer pre-fitted)
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.

How is the NH72 different from the NH70 and NH71?

All three are skeleton movements built for a full dial-side view of the mechanism. The difference is finish: the NH70 is nickel-plated, the NH71 gold-plated. This NH72 is ruthenium grey with a Côtes de Genève decorated rotor. The NH72 ships with a dial holding spacer fitted for easy seating.

What does the NH72 need to look its best?

Pair it with a skeleton or open dial so the movement shows from the front, and ideally a display (sapphire) caseback so it's visible front and back. It's a no-date movement; the ruthenium finish and decorated rotor are the focal point.

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.