10,000+ Customers

1-Year Warranty

10,000+ Customers

1-Year Warranty

10,000+ Customers

1-Year Warranty

10,000+ Customers

1-Year Warranty

10,000+ Customers

1-Year Warranty

10,000+ Customers

1-Year Warranty

10,000+ Customers

1-Year Warranty

10,000+ Customers

1-Year Warranty

10,000+ Customers

1-Year Warranty

10,000+ Customers

1-Year Warranty

Collections

    NH35 Movement

    At the heart of every timepiece beats the Seiko NH35 — a movement born of Japanese precision and a heritage of mechanical mastery.


    Renowned for its precision, durability, and craftsmanship, it stands as a testament to the timeless art of watchmaking.

    Trustpilot reviews

    Excellent 4.8 / 5

    • GMT Master

      ''I found Smodx while searching for reliable Seiko modders, and I’m glad I did. The site is clean, easy to navigate. I ordered a titanium case GMT — absolute perfection.''

      Ryan L.

    • Fast shipping!

      ''I ordered my first Seiko mod through Smodx after seeing their builds on Instagram. Super impressed by the design quality and the smooth checkout process. My only feedback — add more strap options! Otherwise, fantastic watch and fast shipping.''

      Omar S.

    • Submariner

      ''The craftsmanship from Smodx is excellent. I ordered classic black Submariner, and the attention to detail is amazing. Everything feels premium. Highly recommend for watch enthusiasts.''

      Liam D.

    • Highly Recommend!

      ''Great experience overall with Smodx. My custom mod arrived safely and looks even better in person. The only small issue was the wait time — but to be fair, it was clearly stated on the site that each piece is built to order. Totally worth it once you see the final result! ''

      Hiro K.

    • Great Gift!

      ''Bought a Seiko mod from Smodx as a gift for my husband, and it’s his new favorite watch. Customer service was incredibly helpful in guiding me through all the part options. The build feels solid and looks stunning. It came beautifully packaged too. Couldn’t be happier!''

      Jessica R.

      • Express Shipping

        Shipped Within 48h

      • Free Returns

        30-day full refund

      • Safe Transaction

        Secure checkout with full data encryption

      • Customer Support

        Enjoy 24h support from our team