Nautiko | (Open Heart) Silver-Black

The SEIKNAUT MOD Nautilus Open Heart Silver–Black blends modern elegance with mechanical sophistication. Its brushed silver case and bracelet contrast beautifully with the deep black horizontal-striped dial — subtly revealing the beating open-heart mechanism at 9 o’clock.Powered by the trusted SEIKO NH38 automatic movement, this model offers reliability, smooth sweeping motion, and a refined open-heart display that showcases the inner engineering of the watch.A clean, minimalist steel aesthetic paired with an exposed mechanical core makes this timepiece ideal for collectors and style-focused wearers alike.

✅ Case Size: 41mm
✅ Case Thickness: 13mm
✅ Case Material: 316L Stainless Steel
✅ Dial: Black with horizontal brushed pattern, open-heart aperture
✅ Crystal: Sapphire crystal with anti-reflective coating
✅ Movement: SEIKO NH38 Automatic
✅ Water Resistance: 5 ATM (50 m)
✅ Bracelet: Stainless steel
✅ Bracelet Color: Silver
✅ Lug Width: 20mm
✅ Caseback: Exhibition (transparent)
✅ Functions: Hours, minutes, seconds

Processing Time: 2–4 business days
Standard Shipping: 7–12 business days
Express Shipping: 3–7 business days
Worldwide tracking included

Each watch is made to order. Assembly takes 3–5 business days before dispatch; delivery typically takes an additional 7–15 business days.

Tracked worldwide shipping is free. Read the destination details in our shipping policy.

Return conditions and exceptions for custom orders are explained in our returns policy.

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