Black Sea Diver
VAT included · Free shipping
✓ No experience required
✓ Watch components, tools & step-by-step video guidance included
✓ Quick dispatch from Switzerland · Tracked priority shipping
Built by you. Backed by us.
Lifetime protection against manufacturing defects, personal help through the build, and fixed-price completion or repair when you need us to take over.
Build your own mechanical dive watch — and wear the result.
The Black Sea Diver pairs a 40 mm stainless-steel case with sapphire crystal, an exhibition caseback, rotating black dive bezel, luminous hands and markers, and a black-and-grey NATO strap. Choose a black or white dial to make the finished watch your own. The case has a 20 mm lug width and is designed for 100 m water resistance once correctly assembled and sealed.
Buying as a gift or unsure about the fit? See our watch size guide →
Inside is the proven Seiko NH35 automatic movement. You assemble the watch yourself using the included components, watchmaking tools and step-by-step video guidance — no previous watchmaking experience required.
Once finished, the exhibition caseback gives you a view of the mechanical movement inside. The result is a rugged automatic watch that is as satisfying to wear as it is to build.
Gift of the Year 2026 Nominee
Seiko NH35 automatic movement
A proven and reliable Japanese automatic movement that powers the watch you assemble yourself.
Each Horologic watchmaking kit includes:
The movement arrives assembled and the crown stem is already cut to the correct length.
For full shipping, delivery and return information, refer to our Shipping & Returns policy.
Your Horologic kit arrives with the components, tools, and guidance needed to assemble your own automatic watch at home.
Add a second strap
Your kit includes the above displayed strap. Add an extra strap or bracelet to change the character of your watch after the build.
NH35 automatic movement
Powered by a mechanical mainspring rather than a battery, the NH35 winds automatically with the movement of your wrist and can also be wound by hand.
When fully wound, it keeps running for approximately 41 hours—even when you’re not wearing it.
The movement arrives fully assembled. You fit the dial and hands, secure it inside the case, and finish a watch you’ve put together yourself.
The kit is designed for careful beginners. You do not need prior watchmaking experience, but the build requires patience, focus, and a steady hand. Follow the guidance step by step and take your time.
If you enjoy careful hands-on work and following detailed instructions, this kit is designed for you.
REAL WATCH ASSEMBLY, MADE APPROACHABLE
The mechanical movement arrives fully assembled and the crown stem is already cut to the correct length. You take it from there — fitting the dial and hands, casing the movement, installing the crown, closing the case and attaching the strap or bracelet.
It's genuine watch assembly, using real watchmaking tools and components, but designed so that you can enjoy the process without previous experience.
Position the dial, find midnight and carefully install each of the three hands.
Place your completed movement into the case, refit the pre-cut crown and stem, and secure the caseback.
Attach the strap or bracelet, set the time and date, and put on a watch you assembled yourself.
Horologic is made for people who want to give more than another object. The experience of building the watch becomes part of the story behind it — making it especially meaningful for birthdays, Father's Day, Christmas, retirements, or anyone who loves mechanical things.
Compare Sportsman, Black Sea Diver, Explorer and Heritage Two-Tone—four automatic watches you assemble yourself.
Explore all buildsEverything you need to know about our watchmaking kits
Yes. The completed watch is a fully functional automatic mechanical watch powered by the NH35 movement.
No. Horologic kits are curated, inspected, packed, and shipped from Switzerland. Components are sourced internationally and include a Japanese automatic movement.
Not at all. Our kits are designed for beginners. Each kit includes detailed step-by-step instructions, and all the specialized tools you need are included in the box.
Most first-time builders take around 2–3 hours. There is no need to rush, and you can take longer or split the build across sessions.
Personal build support is available without buying a service. We can help you troubleshoot, and replacement parts remain available to purchase if you want to carry out the work yourself.
Prefer us to take over? Our paid fixed-price completion and repair service includes necessary replacement watch components, with no separate assessment fee or additional parts or labour invoice. Possible manufacturing defects follow the separate warranty route: contact us before paying. Explore Horologic Care →
Absolutely. Each kit arrives in premium packaging ready to gift. The recipient can contact Horologic directly for personal build support and aftercare. Where it formed part of the original purchase, the lifetime defect warranty lasts while the original purchaser or original gift recipient owns the watch; paid completion or repair is available separately.
An original order reference is required for a paid service booking. We can help locate it when necessary.
Yes. Horologic ships internationally from Switzerland with tracking. Orders are normally dispatched within 1–2 business days; most arrive approximately 5–10 business days after dispatch, depending on the destination and carrier. Delivery estimates are not guaranteed. Available destinations and shipping charges are shown at checkout.