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Seiko SII caliber NH38A Drawings

Seiko (SII) Caliber NH38A

Seiko SII caliber NH38A Drawings

Manufacturer Seiko (SII, TMI)
Caliber Number NH38A
Movement Type Automatic
Jewels 24
Vibrations Per Hour
21,600 bph
Shock System? Yes
Power Reserve
41 hours
Winding Direction
Bi-directional
Hacking? Yes
Diameter 27.40mm (outside) / 29.36mm (casing)
Height 5.32mm
Functions Hours, minutes, central seconds
Country of Manufacture Japan/Malaysia
Known Brands
Invicta (add more in the comments below)

keepthetime-468-60

 

 

The Seiko caliber NH38A is very similar to the popular caliber NH35A.The NH38 series is often found with an open balance wheel at 9:00 on the dial.

Time Module (TMI) claims an accuracy rating of -20~+40 seconds per day.

What is the difference?

Unlike the NH35A, the NH38A is a basic three hand watch and does not have a day or date complication.

Japan or Malaysia?

The complete Japanese-made caliber number is NH38A3J. For the Malaysia variant, the number is NH38A3M.

The large photo below is of a Seiko NH38A movement in an Invicta 22744 watch.

 

Seiko SII caliber NH38A in an Invicta watch

Submitted by Nathaniel B.

Is the Seiko (SII) Caliber NH38A any good? Share your opinions, experiences and watches below... Keep comments respectful and follow our community guidelines.

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Tracey Deel
Tracey Deel

I have this movement in an ARAGON, was Android by Wing Liang.

Jürgen Albers
Jürgen Albers
Doug
Doug

Helm Khuraburi uses the nh38a

Joris
Joris
Zoroff
Zoroff

Armourlite also uses NH38

Will
Will

I have this watch in a Momentum Morioka watch.

Charles Laigo
Charles Laigo
Bert
Bert

My Phoibos Wavemaster is a great watch but the Seiko movement in it is at least 10 seconds a day slow, a common issue. I wish brands would regulate these movements before shipping!

Rich
Rich

My Giorgio Fedon has this movement.

W
W

Traska Freediver

Øyvind
Øyvind

Used by Giorgi Fedon 1919

Roger Ingram
Roger Ingram

Also found in Traska watches

koimaster
koimaster

I love coming to this site to learn more about movements and to share.

Rudy
Rudy

There is a typo in the table box.
Malaysia not Maylasia. 🙂