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

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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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    Home / All Products / 38mm ST1901 Chronograph LA2201A
    38mm ST1901 Chronograph LA2201A - - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    38mm ST1901 Chronograph LA2201A - - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    38mm ST1901 Chronograph LA2201A - - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    38mm ST1901 Chronograph LA2201A - - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    38mm ST1901 Chronograph LA2201A - - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    38mm ST1901 Chronograph LA2201A - - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    38mm ST1901 Chronograph LA2201A - - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    38mm ST1901 Chronograph LA2201A - - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    38mm ST1901 Chronograph LA2201A - - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    38mm ST1901 Chronograph LA2201A
    38mm ST1901 Chronograph LA2201A - - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts

    38mm ST1901 Chronograph LA2201A

    $599 SGD
    Worldwide
    Delivery         Express
    2–4 Days         Replies In
    1 Day         30-Day
    Returns

    LIMITED & EXCLUSIVE · 100 pieces only. Once this run sells out, it is retired for good — never remade.

    The ST1901 Chronograph. 38mm. One of 100.

    A vintage-styled speedmaster chronograph at the 38mm sweet spot — matt black dial, Swiss Super-LumiNova Old Radium on the hour markers and hands, and a tachymetre engraved into the brushed bezel. Limited and exclusive to 100 pieces.

    Inside is the hand-wound ST1901 — a mechanical chronograph caliber in production since the 1960s. Officially rated -10 to +40 seconds a day; across 30 pieces we tested dial-up, ours ran between -1 and +8 (not every piece will match that, but it tells you how this batch was built). Sapphire caseback, so the caliber is part of the show.

    One of one hundred.
    A hand-wound chronograph with the movement on display.

    Hand-wound ST1901.
    A chronograph workhorse in production since the 1960s — wound by hand, running on show.

    Old Radium lume.
    Swiss Super-LumiNova in the vintage Old Radium tone, on markers and hands.

    Tachymetre bezel.
    Engraved into the brushed bezel — the classic speedmaster read.

    Sapphire both sides.
    Double-domed sapphire up front, clear sapphire caseback behind the caliber.

    Heads up — wearing it

    Hand-wound: wind it to run it. Officially rated -10/+40 s/day; our 30-piece dial-up test ran -1 to +8. Quick-release leather strap, butterfly clasp, 100m water resistance.

    • Specs

      1. Model LA2201A
      2. Movement ST1901 (Hand Wind Chronograph)
      3. Case Material 316L Stainless Steel
      4. Case Diameter 38mm
      5. Case Thickness 13.3mm (12.3mm excluding dome sapphire)
      6. Lug Width 20mm
      7. Lug To Lug 46mm
      8. Crystal Double Domed Sapphire With Clear Anti-Reflective Coating
      9. Caseback Clear Sapphire
      10. Strap Quick Release Genuine Leather
      11. Clasp Butterfly
      12. Water Resistant 10 bar / 100m
      1. 1x 38mm ST1901 Chronograph LA2201A
      2. 1x Quick Release Genuine Leather Strap

    • The ST1901 is a hand-winding mechanical chronograph caliber made from the 1960s to this very day — one of the oldest and most reliable workhorse chronograph movements in existence. Official accuracy is rated -10 to +40 seconds per day; across 30 pieces we tested dial-up, ours ran between -1 and +8 seconds per day. Not every piece will match that, but it tells you how this batch was built.

      Movement Specs

      1. Movement Model ST1901
      2. Movement Type Mechanical Chronograph - Manual / Hand Wind
      3. Movement Diameter 31.3mm
      4. Movement Thickness 6.25mm
      5. Functions hours, minutes, seconds, date, stopwatch
      6. Shock Protection Yes - Incabloc system
      7. Frequency 3 Hz (21.600 vph)
      8. Daily Rate -10 to +40 s/day
      9. Power Reserve 50 Hours (Chronograph OFF), 45 Hours (Chronograph ON)

    Questions, Answered

    Everything worth knowing before you build.

    What is the ST1901 movement?

    A hand-winding mechanical chronograph caliber in production since the 1960s — one of the oldest and most reliable workhorse chronograph movements in existence. Official accuracy is rated -10 to +40 seconds per day; across 30 pieces we tested dial-up, ours ran between -1 and +8 seconds per day (not every piece will match that, but it shows how the batch was built).

    Is the ST1901 chronograph a limited edition?

    Yes — each ST1901 model is limited and exclusive to 100 pieces. The LA2201A speedmaster-style chronograph and the LA2201B pulsograph are 100 pieces each.

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