GMT Mod - Black

The GMT Mod Black is built for anyone who has to keep track of two time zones simultaneously — whether that means coordinating calls across continents, managing a remote team, or simply staying connected to home while travelling. At 40 mm with a striking ceramic GMT bezel, this Seiko mod marries genuine traveller functionality with a clean sport-watch aesthetic. MedoMods built it around the Seiko NH34, a movement designed from the ground up to display two time zones mechanically and independently.

Movement

The Seiko NH34 is a dedicated GMT automatic — not a simple 24-hour hand riding off the hour wheel, but a true independent GMT with hacking and hand-winding. The fourth GMT hand points to a second time zone on the 24-hour graduated ceramic bezel, allowing you to read both home time and local time at a glance without touching the crown. Like all NH-series movements, it self-winds via the oscillating rotor during normal wear, and hacks for precise time-setting.

Case & Crystal

The 40 mm stainless steel case is secured with a screw-down crown at 5 ATM — appropriate for everyday wear and splashes. The sapphire crystal is treated with Super-LumiNova and an anti-reflective coating, keeping the dial readable in the varied lighting conditions a traveller encounters. The ceramic bezel is harder than steel and resists the scratching that would ruin a painted aluminium insert over time, which means the 24-hour markings stay crisp for years.

Dial & Design

The all-black dial keeps the visual hierarchy clean: hour, minute, and seconds hands in the foreground; the red or contrasting GMT hand drawing the eye to the bezel for the second time zone. Super-LumiNova on the dial ensures the watch is readable in a dark cabin at 35,000 feet, not just under office lights. The safety-clasp stainless steel bracelet adjusts quickly, which matters when you are dealing with wrist swelling on a long flight.

On the Wrist

The 40 mm diameter keeps the GMT Mod Black versatile — it goes from business meetings to airport security to a dinner table without demanding attention. The stainless steel bracelet adjusts across a wide range with a solid safety clasp that holds securely during travel. For anyone who has relied on a phone alarm to track time zones, wearing a proper GMT watch changes the daily experience in a surprisingly practical way.

Why MedoMods

This Seiko mod is hand-assembled, inspected before dispatch, and ships EU-wide without customs complications. If you want true two-time-zone functionality — not just a decorative 24-hour hand — in a handcrafted Seiko mod with sapphire crystal and a ceramic bezel, the GMT Mod Black delivers it directly. The exhibition case back lets you admire the NH34 movement.

• Case: 40 mm stainless steel – timeless and stylish

• Movement: Automatic Seiko NH34 – dedicated GMT, precise and reliable

• Crystal & Luminosity: Sapphire crystal with Super-LumiNova – clear and highly readable

• Crown & Water Resistance: Screw-down crown, 5 ATM – suitable for everyday wear

• Bezel: Ceramic GMT bezel – track a second time zone with precision

• Bracelet: Adjustable stainless steel with safety clasp

Ordering and delivery

• Every watch comes with a 2-year warranty from delivery. It covers manufacturing defects and functional problems under normal use. It doesn't cover scratches, damage from opening the watch, or water damage.
• 10–12 days after ordering
• 14-day withdrawal period. The period starts on receipt. For deliveries to the UK, US and Australia, we offer 14-day returns.