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Diver Watch Case - 38mm - SKX013/Submariner Edition (Fits NH & GMT Movements)

Fit Movement

ONLY 8 main components are needed to complete a watch.
Watch Case
Bezel Insert
Chapter Ring
Movement Holder (optional)
Tweezer (optional)
**All components can be selected above. If non-rotatable bezel is selected, bezel insert is not required.

Made exclusively for us with quality assurance by ISO 9001 Certified manufacturers.



GMT WIS are going to love this!

After almost a year of prototyping and as always, we are the first and proud to present to you a one of a kind diver watch case in the market that can fit both Japanese Seiko NH movements (NH35, NH36, NH37, NH38, NH39, NH70, NH71), Swiss ETA2893 and Sellita SW330 GMT movements. This watch case design will undoubtedly opens up a myriad of breathtaking opportunities for customisations.

This is also one of the first aftermarket case designed to fit high-end Swiss GMT mechanical movement, ETA2893 and Sellita SW330.

Designed uniquely with a submariner crown guard while retaining characteristic of an SKX.

That's right! This case fits ALL our SKX013 mod parts!! (Refer to FAQ below)

Water resistant to 200m.

Build your own watch from scratch!

This is 38mm case.
For 42mm case, visit here

***Read FAQ below for more details.

This 38mm diver watch case comes complete with:
  • 1x Case Body
  • 1x Bezel Click Spring
  • 1x Caseback (Solid or sapphire)
  • 1x Caseback gasket
  • 1x Crown
  • 1x Crystal Gasket
  • 2x Fat Spring Bars
  • 1x GMT Movement Spacer (If GMT movement is selected)
    1. Quality Swiss Production Quality, ISO 9001 Certified
    2. Case Material 316L Stainless Steel
    3. Case Diameter 38mm
    4. Case Thickness 9.9mm (Without bezel and crystal)
    5. Case Length 44.5mm
    6. Lug Width 20mm
    7. Caseback Screw down (Solid, Mirror polished or See-thru Sapphire)
    8. Crown Screw down
    9. Water Resistant 200m / 20atm
    10. Fit Movements NH35, NH36, NH37, NH38, NH39, NH70, NH71, ETA2893, SW330
    1. 1x Case Body
    2. 1x Bezel Click Spring
    3. 1x Caseback (Solid or sapphire)
    4. 1x Caseback gasket
    5. 1x Crown
    6. 1x Crystal Gasket
    7. 2x Fat Spring Bars
    8. 1x GMT Movement Spacer (If GMT movement is selected)

    All photos of watches with modification parts are for illustration purposes only and are not included with the selected modification part purchased.

  • Recommended Mods With:

    1. Swiss Super-LumiNova® BGW9 Hands
    1. A Complete Guide On How To Mod Your SEIKO Watch Dial And Hands (Includes Photos & Video)
    2. Learn about fitting dials with four dial legs
    1. Does this watch case fit SKX013 aftermarket parts?
      Yes, only to our own SKX013 aftermarket parts since we have tested it. However, the two parts that are non-interchangeable and unique to this case are the crown and caseback, which are provided with this case.
    2. Is caseback for NH and ETA2893/SW330 GMT movements interchangeable?
      No, casebacks are NOT interchangeable. GMT movement is significantly smaller and slimmer than NH movement, its caseback is therefore significantly thinner than NH caseback.

      **Using GMT caseback on a case fitted with NH movement will inevitably damage the NH movement! Please ensure that you select the proper caseback for its respective movement.
    3. How is NH movement fitted into the watch case?
      NH movements can be fitted into the watch case directly without any addition GMT movement spacer. A unique NH caseback is required to secure and close up the watch case.
    4. How is ETA2893/SW330 GMT movement fitted into the watch case?
      A unique GMT movement spacer (gold colour in the photos) is required to encase the GMT movement inside the watch case. Thereafter, another unique caseback specifically for this movement is require to secure and close up the watch case.
    5. I have bought the NH movement version of this case. But I want to fit an ETA2893/SW330 GMT movement into it now.
      Too easy. You just need to purchase the GMT movement caseback and spacer separately, which you can select on this product page. That would allow you to fit GMT movement. Likewise, you can purchase NH movement caseback separately.
    6. Will your dial collections fit ETA2893/SW330 GMT movement?
      Yes and no. No because the dial legs are designed for NH movements. So current dial collections with NH dial legs will not fit into GMT movement. Furthermore, the date windows do not align between both movements. On the bright side, yes, it can still fit (only no date dials), but requires you to remove all the dial legs and manually align and adhere with adhesive (e.g. double-sided tape). We will release GMT movement-specific dials next year.
    7. Do you have ETA2893 or Sellita SW330 movement?
      Coming next year.
    8. Do you have ETA2893 or SW330 movement hands?
      Coming next year.
    9. Do you have bracelets for this watch case?
      We will be releasing our own selections of bracelet for our watch case in first half of 2021. Meanwhile, this case has lugs designed exactly like SKX013. Hence, OEM SKX013 bracelets can fit this watch case. We can only guarantee OEM SKX013 bracelets will fit. For aftermarket bracelets for SKX013, it may or may not fit. You will have to check with the respective retailer you purchased from.
    10. Hands installation on ETA2893/SW330 movement is more difficult than NH movements.
      Correct. Compared to NH movement, it is extremely difficult. ETA2893 and Sellita SW330 movements are smaller, slimmer and have about 40% lesser space between the hands as compared to NH movements. What's more, within the 40% lesser space, you need to fit 4 hands (hour, minute, second, GMT) instead of 3 hands (hour, minute, second). This makes your margin of error very tight when it comes to hands installation. Just take hour and minute hands spacing for example; On NH movement, there is 0.6mm space, while on ETA2893/SW330, there is 0.4mm space.

      **Unless you are an extremely experienced modder or a certified professional watchmaker, we do not recommend any individual to work with GMT movements.

Customer Reviews

Based on 16 reviews
Jayme Hlushak (Calgary, CA)
Using this mod part for: NH36 build
Great case

Very nice case, all the parts fit together quite well, paired with a Lucius Atelier Snowflake Submariner dial and a Namokimods black OSM style ceramic bezel. Very happy with the quality. Thanks!

Faraj Home (Manama, BH)
Beyond my expectations.

Quality finish , fantastic look and feel. And delivered so quickly.

Henry Ortiz (Al Ain City, AE)
Using this mod part for: SK013
Good quality looks better in person

Perfect for my small wrist and fast delivery too. Will definitely buy again this friendly seller

Gabriel Paulet (Greenwich, GB)
Using this mod part for: Skx013
Lovely case

I was tworn in between this case from Ariel and another skx013 case from a competitor and I'm glad I went with this one . Perfect case , all skx013 parts fitted nicely.

pierre (Colomiers, FR)
Using this mod part for: NH36A with all custom parts
Excellent case

The quality of this case is very very high. I was amazed by it. Thanks a lot Lucius Atelier

Mauricio Aguiar (Cincinnati, US)
Using this mod part for: Batman-inspired 38mm submariner SKX013
Nice case!

Very happy to find a 38mm version of the explorer case! Finish on the case is truly great! If I may suggest a couple of things to improve, if possible, it would be the crown, which is very hard to screw and unscrew due to the crown guards (it may be the same with the original Rolex, but I wouldn’t know). Also, my original Skx013 end links don’t fit well. Again, it sure if they both got bent, but the jury is still out about that.

Joost (Tiel, NL)
Using this mod part for: Custom case
Beautiful case

Beautifully made and perfect size for me. Perfect that it can be customized with the SKX013 parts.
I also like the handwritten notes.

fabiano pratesi (Pistoia, IT)

The best midsize case

Tim C.
Using this mod part for: Aftermarket cases
I love this case!

So well made and looks great! I highly recommend it for any SKX013 style watch mod.

Jason (Toronto, CA)

Absolutely love this case. The finishing is perfect, and using the Skx013 platform opens up many options for customization. I also love that all the watch parts offered meet ISO standards!