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/Maylasia
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.

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Tracey Deel
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Tracey Deel

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

Jürgen Albers
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Jürgen Albers
Doug
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Doug

Helm Khuraburi uses the nh38a

Joris
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Joris
Zoroff
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Zoroff

Armourlite also uses NH38

Will
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Will

I have this watch in a Momentum Morioka watch.

Charles Laigo
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Charles Laigo
Bert
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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
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Rich

My Giorgio Fedon has this movement.

W
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W

Traska Freediver

Øyvind
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Øyvind

Used by Giorgi Fedon 1919

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