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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) NH36 Automatic Movement - Day Date @ 4H Crown (Black)
    Seiko (TMI) NH36 Automatic Movement - Day Date @ 4H Crown (Black) - Regulated (0 to +8 secs/day) - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    Seiko (TMI) NH36 Automatic Movement - Day Date @ 4H Crown (Black) - Regulated (0 to +8 secs/day) - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    Seiko (TMI) NH36 Automatic Movement - Day Date @ 4H Crown (Black) - Regulated (0 to +8 secs/day) - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    Seiko (TMI) NH36 Automatic Movement - Day Date @ 4H Crown (Black) - Regulated (0 to +8 secs/day) - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    Seiko (TMI) NH36 Automatic Movement - Day Date @ 4H Crown (Black) - Regulated (0 to +8 secs/day) - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    Seiko (TMI) NH36 Automatic Movement - Day Date @ 4H Crown (Black) - Regulated (0 to +8 secs/day) - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts

    Seiko (TMI) NH36 Automatic Movement - Day Date @ 4H Crown (Black)

    $100 SGD - $150 SGD
    Options

    Day + date, aligned for 4 o'clock crowns.

    Genuine Seiko NH36 automatic movement with day and date wheels aligned for cases with the crown at 4 o'clock. Same day+date platform as the standard NH36, but the calendar is positioned for a 4 o'clock crown case. Use this version only when your case has its crown at 4 o'clock.

    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.

    Built for 4 o'clock crown cases.
    The day and date wheels are aligned for cases with the crown at the 4 o'clock position. Fitting this in a standard 3 o'clock case will misalign the calendar, pick the standard NH36 for those.

    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 Date · 6 o'clock dial 3 or 4 o'clock Black White
    NH36 Day + Date 3 o'clock only Black White
    NH36 · THIS MOVEMENT 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 NH36A
      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 Day & 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 Cases with 4 o'clock crown position
      3. Dial 28.5mm Seiko Mod dials — match the date aperture to the movement
      4. Hands NH-series compatible

      Use this 4 o'clock version only in a case designed for a 4 o'clock crown. For standard 3 o'clock crown cases, choose the regular NH36.

      1. 1x NH36 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.

    When do I need the 4 o'clock crown NH36 instead of the standard one?

    Use this 4 o'clock version only when your case has its crown at the 4 o'clock position. The NH36's day wheel is pre-aligned to the crown position, so a standard (3 o'clock) NH36 would show the day text skewed in a 4 o'clock case, and vice versa. Match the movement to your case's crown position.

    Why does the NH36 come in 3 o'clock and 4 o'clock versions?

    Because of the day wheel. Unlike a date disc, the day wheel is pre-aligned to a specific crown position so the day text reads upright in the window. We stock a 3 o'clock version and a 4 o'clock version — pick the one matching your case's crown position. (Date-only and no-date calibers don't have this constraint; they fit either crown.)

    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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