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SKX013 Diver 38 Black Ultra Thin Edition — side profile showing 10.86mm ultra-thin case thickness

Ultra Thin Edition
Seikonaut Bracelet 20/16mm [TITANIUM] - - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts

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  • SKX013 Diver 38 Black Ultra Thin Edition — side profile showing 10.86mm ultra-thin case thickness

    Ultra Thin Edition
  • Seikonaut Bracelet 20/16mm [TITANIUM] - - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts

    Seikonaut
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    Home / Special Collection Excluding Limited Edition / Seiko (TMI) NH35 Automatic Movement - Date @ 6H (Black)
    Seiko (TMI) NH35 Automatic Movement - Date @ 6H (Black) - Regulated (0 to +8 secs/day) - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    Seiko (TMI) NH35 Automatic Movement - Date @ 6H (Black) - Regulated (0 to +8 secs/day) - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    Seiko (TMI) NH35 Automatic Movement - Date @ 6H (Black) - Regulated (0 to +8 secs/day) - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    Seiko (TMI) NH35 Automatic Movement - Date @ 6H (Black) - Regulated (0 to +8 secs/day) - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts

    Seiko (TMI) NH35 Automatic Movement - Date @ 6H (Black)

    $100 SGD - $150 SGD
    Options

    The workhorse date movement.

    Genuine Seiko NH35 automatic movement with date function, crown at 3 o'clock, with black date wheel. Date window sits at 6 o'clock, aligned for dials with a 6 o'clock date aperture. The default choice for a date build and the most common upgrade from older 7S26/7S36 calibers, adding hacking and hand-winding the older movements lack.

    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.

    Date, done simply.
    A clean date complication with quick-set correction. Crown out one click to set the date, two clicks to hack and set the time. The most-used movement in the Seiko mod world for good reason.

    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.

    In every box.
    Each movement ships with a full-length threaded stem and a dummy stem with plastic crown. Additional full-length threaded stems are available separately.

    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 · THIS MOVEMENT 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.

      1. Manufacturer Time Module Inc. (TMI)
      2. Caliber NH35A
      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 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 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 All Ultra Thin Edition cases (TYPE M)
      3. Dial 28.5mm Seiko Mod dials — match the date aperture to the movement
      4. Hands NH-series compatible

      A date dial pairs with the NH35, the date window must line up with the dial's aperture (6 o'clock for this 6H version). Fits every Ultra Thin Edition case that takes a TYPE M movement.

      1. 1x NH35 movement
      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.

      1. A Complete Guide On How To Mod Your SEIKO Watch Dial And Hands (Photos & Video)
      2. Fitting dials with four dial legs
      3. Seiko Modding: The Complete Build Guide (2026)

    Questions, Answered

    Everything worth knowing before you build.

    Which dial does the NH35 Date @ 6H need?

    This is the special-order NH35 built for a 6 o'clock date. Two things are set for that position: the date wheel sits at the 6 o'clock aperture, and the numerals printed on the wheel are oriented to read upright through a 6 o'clock window. It needs a dial whose date window is at 6 o'clock. A standard NH35's date sits at the 4:30 position with its numerals oriented for that spot, so it won't line up — and this 6H movement won't read correctly under a standard date dial. Same NH35 base; the date position and numeral orientation are what differ.

    Will the NH35 fit a 3 or 4 o'clock crown case?

    Yes, either. The NH35 is a date-only movement, so the crown stem threads at 3 or 4 o'clock and the date disc isn't affected — the dial's date window position is what changes, not the movement. (The day+date NH36 is the one caliber where crown position is fixed, because of its day wheel.)

    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.

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