Seiko Nautilus Mod (Nautiko) – Black Open Heart
Seiko Nautilus Mod (Nautiko) – Black Open Heart
Made to be looked at twice.
Genuine Seiko movement, sapphire crystal and a solid stainless steel case. Built to wear every day.
Watch sizing
| Case size | Suits wrists | How it wears |
|---|---|---|
| 36 mm | 14–17 cm | Slimmer and dressier |
| 39–41 mm | 16–20 cm | The classic full look |
Every bracelet adjusts to your wrist with the included screwdriver. If you're between sizes, pick the look you prefer.
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Change your mind within 24 hours of ordering? Full refund, no questions.
Faulty or not as described? Repaired, replaced or refunded.
Every watch ships with a travel case + sizing tool.
The porthole classic in its most serious colour, engine on display. A$349.
Black horizontally embossed dial with baton markers, integrated octagonal bezel, stainless steel case and bracelet. The embossing runs in fine horizontal lines across the black dial, so the face reads flat from a distance and comes alive the moment light rakes across it. Through the open window the balance wheel keeps its own rhythm, a small mechanical heartbeat under a dark surface. This is the version you wear with a white cuff and let people lean in. It sits as comfortably over dinner as it does across a Monday of meetings, and the integrated bracelet keeps the whole profile low and clean on the wrist.
Specifications
- Movement: Seiko NH38 automatic
- Case: 41mm stainless steel
- Crystal: Sapphire
- Dial & bezel: Black horizontally embossed dial with baton markers, integrated octagonal bezel, stainless steel case and bracelet
- Strap: Steel bracelet
- Water resistance: Everyday wear (splash-resistant, not dive-rated)
The movement
The window is honest. Behind it sits a genuine Seiko NH38 automatic, wound by the motion of your arm, with no battery anywhere in the case. What you see moving is what keeps the time.
What you get from me
Before it ships, I photograph your watch and send it to you. Not a stock photo of the model. The actual one going in your box.
If it turns up faulty, damaged in transit or not the watch you ordered, email me your order number and a photo and I will repair it, replace it or refund it, postage on me both ways. After that, the 1-year warranty covers the movement, crystal, case and dial.
Made to order
Your watch does not exist yet. It is built for you, which takes 2 to 4 weeks before it ships. Because I build it to the spec you choose, I cannot take it back just because you changed your mind, so ask me anything before you order and I will tell you straight.
Ready?
Add it to your cart and I will get it started.
What's included
What's included
Every order arrives with your watch, a travel case and a sizing tool for adjusting the bracelet. Inspected before dispatch and backed by a 1-year warranty.
Sizing & fit
Sizing & fit
Stainless steel case and bracelet. Where more than one case size is offered, choose yours from the size selector above. Smaller sizes suit slimmer wrists, larger sizes wear with more presence. A screwdriver is included so you can adjust the bracelet links to your wrist at home. Not sure which size suits you? Message us before you order and we will help.
Shipping & returns
Shipping & returns
Every watch is made to order, with free worldwide shipping. Build and dispatch times are set out in our Shipping Policy. Because each watch is built to the specification you choose, we do not accept returns for change of mind. Changed your mind before we start? Email us within 24 hours of ordering and we will cancel and refund you in full. If anything is wrong with your watch we fix it: a fault, transit damage or the wrong model is repaired, replaced or refunded, and we pay the postage both ways. Orders outside Australia may attract import duty, tax or VAT on arrival. These are set by your local customs authority and are the customer's responsibility.
Warranty
Warranty
Backed by a 1-year warranty against manufacturing faults in the movement, crystal, case and dial. Faulty or not as described? We repair, replace or refund at no cost to you.
What is a Seiko mod?
What is a Seiko mod?
A watch built on a genuine Seiko automatic movement (the NH-series mechanical calibre Seiko uses in its own watches), fitted with a custom case, dial, hands and bracelet in a design inspired by iconic timepieces. Self-winding, no battery, serviceable for decades. It's not a copy of anyone's watch and we never pretend otherwise: it's the mechanical heart you want, without the luxury markup. Read the full story.
Nautilus (Black Open Heart) | NH38 Custom Mod Watch
How it works
Questions people ask before ordering
Is this a real watch or a fake?
It is a real watch and an original Rosevari build. Inside is a genuine Seiko automatic movement; the case, sapphire crystal and dial are parts we choose and stand behind. A fake is sold as the genuine article. Every Rosevari is sold openly as exactly what it is, a custom Seiko mod, with every part disclosed.
Is it automatic?
Every watch runs a genuine Seiko movement. GMT models use the self-winding NH34 automatic with an independently set GMT hand, datejust styles use the NH35 automatic, and chronograph builds use the VK63 meca-quartz. The exact movement for this watch is named in the specifications above.
How much does it cost?
This build is $255.00 USD with free shipping. Prices are shown in Australian dollars for Australian customers, and there are no extra charges at checkout for AU orders.
How long until it is on my wrist?
Every watch is made to order. Build and dispatch times are set out in our Shipping Policy. If it arrives faulty, damaged in transit, or not what you ordered, we repair, replace or refund it and pay the postage both ways.