SEIGMT JOKER

Q: What movement powers your GMT Seiko Mods and how reliable is it?

We use the Seiko NH34 (4R34) automatic GMT —21,600 bph, 24 jewels, hand-winding and hacking, ~ 41-hour power reserve . It’s a proven, serviceable workhorse.

Q: Are these true GMT or “caller GMT”?

They’re caller GMT : the GMT (24-hour) hand sets independently ; the local 12-hour hand is not jump-adjustable.

Q: How do I set the GMT hand to track a second time zone?

Set local time → pull crown to first click → turn one direction to move the GMT hand (other direction sets date) → align the GMT hand to your second zone.

Q: Is the bezel bidirectional or unidirectional?

Our standard GMT builds use bidirectional 24- or 48-click bezels for quick offset. Unidirectional (120-click) options are available on request.

Q: Can I choose different bezel inserts (Batman/Pepsi/Coke/Stealth)?

Yes— Pepsi, Batman, Coke, gilt, stealth , and more.

Q: Can I upgrade to ceramic bezel, screw-down crown, or display back?

Absolutely— ceramic inserts, screw-down crowns/tubes, display or solid casebacks are available.

$359.00

$499.00

FREE WORLDWIDE DELIVERY ALL ORDERS OVER $200

14 DAY MONEY BACK GUARANTEE

1 YEAR WARRANTY INCLUDED

BRACLET STYLE:

OYSTER JUBILEE BLACK SILICONE

Variant

Description

Inspired by the legendary GMT design, the SEIGMT JOKER is crafted for world travelers and enthusiasts who demand precision with style. At its heart lies the prestigious Seiko NH34 automatic movement, delivering smooth functionality and accurate dual-time tracking.

This 40mm timepiece is hand-assembled by expert watchmakers, offering the perfect harmony of excellence, durability, and accessibility. Built with premium materials like sapphire crystal and ceramic bezel, it’s designed to perform as flawlessly as it looks.

Specifications

Diameter: 40mm (excluding crown)
Movement: Seiko NH34 automatic movement
Thickness: 12mm
Crystal: Sapphire, scratch-resistant with anti-reflective treatment
Lume: Luminova hands and markers
Case: 316L stainless steel
Crown: Screw-down for added durability
Bezel: Ceramic rotating bezel
Bracelet: 316L stainless steel with secure clasp
Lugs: 20mm
Case Back: Exhibition crystal (see-through) or solid steel option
Wrist Size: Adjustable 14.5cm – 22cm
Water Resistance: 3 ATM
Functions: Dual-time GMT complication (fully functional)

WHAT INCLUDED?

Premium watch box
Watch tool set for adjustments
1 year limited warranty
Lifetime aftercare support
Exclusive offers and first to know about new releases

SEIGMT JOKER

$359.00

$499.00

SEIKOGMT

SEIKOGMT states its purpose in the name. “GMT” denotes Greenwich Mean Time, the mean solar time kept at the Royal Observatory in Greenwich, London. Since 1884, that prime meridian has been the reference for dividing the world into 24 time zones. This model, inspired by the GMT-Master II introduced in 1982, serves the same practical function as its forebear. A triangle-tipped 24-hour hand and a 24-hour-graduated, bidirectional rotating bezel let the wearer read a second time zone at a glance. The essential difference between the two lies in how the local hour is adjusted. On our SEIKOGMT models, the local hour hand moves in one-hour jumps—independent of the other hands and without stopping the movement—so travel changes can be made quickly and precisely.

Cerachrom bezel

Our patented ceramic bezel insert uses high-technology materials for lasting color and hardness. The initial solid-black insert released in 2005 was followed by years of R&D that ultimately produced a single-piece, two-tone insert built as a true monobloc.

Cerachrom insert

Debuting in blue/black (2013) and later in the classic red/blue (2014), the two-tone ceramic bezel insert now also comes in brown/black, grey/black, and green/black for left-crown GMT variants. The material’s ultra-high hardness makes it nearly scratchproof and demands special tooling to machine. Colours don’t fade under UV, and the ceramic’s inert composition means it will not corrode. The 24-hour scale is formed directly in the ceramic and then PVD-filled with contrasting precious metals—yellow or rose gold, or platinum.

Oyster and Jubilee bracelets

Traditionally paired with the rugged three-link Oyster bracelet, the SEIKOGMT uniquely also comes on the five-link Jubilee, a rarity among professional models. Introduced in the late 1930s, the Oyster’s wide, slightly arched links are renowned for strength and continue to be the collection’s most versatile bracelet.

CUSTOMER REVIEWS

What our customers say

Very good 4.8/5 (from 895 reviews)

My BlackBay-style is a daily favorite. The chrono snaps back cleanly, finish is amazing. Great value!

Verified shopper

Jane K.

Oct 7, 2025

My first Seiko mod and now I get the hype. NH35 runs smooth, crown action is tight, and the ceramic bezel has a nice click. Arrived fast with tracking. Highly recommended!

Verified shopper

David H.

Oct 5, 2025

Beautifully crafted Seiko mods – exceptional quality and service!

Verified shopper

Mike L.

Sep 30, 2025

My first order, Great customer service and the top quality product, will definitely order from them again soon.

Verified shopper

Jonathan R.

Sep 28, 2025

As a customer who already bought about 10 watches from Auro and also as a watch collector. This is an exceptional concept that I am thrilled to ever found it!!!! IT WORSE EVERY PENNY!!!

Verified shopper

Robert M.

Sep 27, 2025

My Second Purchase, Very easy to understand website and ease of ordering. Product Quality and Customer Service are second to none. 5 Star experience!!!

Verified shopper

Sarah P.

Sep 23, 2025

I ordered my SEIKOGMT white with a blue leather strap and really love the watch. I like the clasp on the strap and the watch customized to my preference stirs a little bit of extra pride every time I look at it. It's solid, heavy and feels like the quality of a watch 10x higher in price.

Verified shopper

Jose P.

Sep 21, 2025

This is watch number 2 from Auro Custom Watches! Not only do i love the one of a kind customization, but the addition of Seiko movement describes the quality of the time piece. I will be purchasing more for sure! I highly recommend!

Verified shopper

Kevin N.

Sep 19, 2025

Need help?

Frequently Asked Questions

What movement powers your GMT Seiko Mods and how reliable is it?

We use the Seiko NH34 (4R34) automatic GMT—21,600 bph, 24 jewels, hand-winding and hacking, ~41-hour power reserve. It’s a proven, serviceable workhorse.

Are these true GMT or “caller GMT”?

They’re caller GMT: the GMT (24-hour) hand sets independently; the local 12-hour hand is not jump-adjustable.

How do I set the GMT hand to track a second time zone?

Set local time → pull crown to first click →turn one direction to move the GMT hand(other direction sets date) → align the GMT hand to your second zone.

Is the bezel bidirectional or unidirectional?

Our standard GMT builds use bidirectional 24- or 48-click bezels for quick offset. Unidirectional (120-click) options are available on request.

Can I choose different bezel inserts (Batman/Pepsi/Coke/Stealth)?

Yes—Pepsi, Batman, Coke, gilt, stealth, and more.

Can I upgrade to ceramic bezel, screw-down crown, or display back?

Absolutely—ceramic inserts, screw-down crowns/tubes, display or solid casebacks are available.

Free shipping

Free worldwide shipping and returns - customs and duties taxes included

Customer service

We are available from monday to friday to answer your questions.

Secure payment

Your payment information is processed securely.

1 year warranty

All orders come with 12 month worry-free warranty.

SEIGMT JOKER

Specifications

CUSTOMER REVIEWS

Frequently Asked Questions

TAG US TO GET FEATURED

Join the community with #AUROCUSTOMWATCHES