Seikomariner | Black on Black

Seikomariner – Automatic Diver Watch

The Seikomariner Diver is a custom-built automatic watch designed for precise dual-time tracking and everyday reliability. Powered by the genuine Seiko NH35 GMT automatic movement, it offers true GMT functionality with a bold, modern design and a strong wrist presence.
Crafted from durable 316L stainless steel, the case and bracelet deliver excellent corrosion resistance, long-term durability, and a refined finish. A sapphire crystal provides strong scratch resistance and clear legibility, making GMT MOD a reliable daily-wear GMT watch.

Key Features

• Genuine Seiko NH35 automatic 
• Automatic with hacking & hand-winding
• 316L stainless steel case and bracelet
• Sapphire crystal, scratch-resistant
• Adjustable bracelet for a secure, comfortable fit
• Free bracelet adjusting tool included

Specifications

• Case diameter: 40 mm (excluding crown)
• Thickness: approx. 12 mm
• Movement: Seiko NH35 Automatic
• Crystal: Sapphire (anti-scratch)
• Bracelet: 316L stainless steel, adjustable (approx. 14.5 cm – 22 cm)
• Water resistance: 5ATM

Components & Materials

• Case: 316L Stainless Steel
• Bracelet: 316L Stainless Steel
• Crystal: Sapphire
• Movement: Seiko NH35 GMT Automatic

Build, QC & Shipping

Each watch is assembled, checked, and quality-controlled before shipping to ensure proper function and finish.
We offer international free tracked and secured shipping. Taxes and customs duties are included, with no additional fees on delivery. Delivery times may vary depending on destination and order volume.

A free bracelet adjusting tool is included for easy at-home sizing.

Disclaimer

This is an independently built custom mod watch assembled with aftermarket components and a genuine Seiko movement. It is not an original product of any other watch manufacturer and is not affiliated with, sponsored by, or endorsed by any third-party brand. All trademarks belong to their respective owners.