Seikomariner | Custom Diver Mod Blue “Ocean” Dial

The Seikomariner Custom Diver in Blue Ocean Dial is the kind of Seiko mod that earns a second glance from people who know watches. The Ocean dial — a layered, water-inspired blue that shifts between teal and deep navy depending on the light — is the centrepiece, framed by a 40 mm 316L stainless steel case and a matching steel bracelet that sits flush from every angle. This is a sport diver built for the collector who wants something genuinely custom, not just a re-bezel.

Movement

Power comes from the Seiko NH35 automatic with hacking and hand-winding. At approximately 12 mm thick and 40 mm across, the case is slim enough to slip under a shirt cuff when the occasion demands. The bracelet adjusts from roughly 14.5 cm to 22 cm via the included sizing tool — no watchmaker visit required.

Case & Crystal

Case and bracelet are both 316L stainless steel — one of the more corrosion-resistant alloys you will find at this price point. The sapphire crystal resists daily scratching, and water resistance is rated to 5 ATM: safe for hand washing, rain, and casual splashes. Every watch is assembled and quality-checked before it leaves the workshop.

Dial & Design

The Ocean dial is offered with or without a logo — a genuine choice rather than an afterthought. Clean indices sit against the blue background with strong contrast for quick reading in motion. The design language is purposeful: a sport diver that reads as confident without being loud. Choose the variant that fits how you want the dial to look.

On the Wrist

The 40 mm case and 12 mm profile make this a comfortable all-day piece. The 316L bracelet adjusts smoothly and the security clasp stays locked during activity. A free bracelet adjustment tool ships with every watch so you can resize at home in minutes without tools you do not already own.

Why MedoMods

Each Seikomariner is assembled and quality-checked by MedoMods before dispatch. EU shipping means no surprise customs charges on delivery. You receive a genuinely handcrafted Seiko mod — not a factory replica — with a movement and materials specification that justify every euro of the price.

• Case diameter: 40 mm (excluding crown)

• Thickness: approx. 12 mm

• Movement: Seiko NH35 Automatic – hacking & hand-winding

• Crystal: Sapphire, anti-scratch

• Case: 316L Stainless Steel

• Bracelet: 316L Stainless Steel, adjustable approx. 14.5 cm – 22 cm

• Water resistance: 5 ATM

• Included: Free bracelet adjusting tool