The modding scene has finally caught up to the demand for GMT parts, with plenty of compatible options available for NH34-based builds. One part category where you’ll be spoiled for choice are bezel inserts - most of you are probably going for the ceramic insert with a 24-hour marker, maybe with a Coke or Pepsi colorway. But there are definitely other styles out there that will add a unique touch to your mod. In this article, we’ll explore the various GMT bezel insert options, helping you create a watch that’s both functional and visually striking.


Why the Bezel Insert Matters in GMT Builds

Source: @caseanddial on IG

 

Obviously, the main reason is because you’ll need some way to track the second time zone, otherwise your GMT watch is much less functional. And since dials normally only have 12 hour markers, and chapter rings might be too small to read easily at a glance, bezel inserts are where you’ll usually find your 24-hour marker.

Beyond functionality, the bezel insert plays a key role in defining the watch’s overall look. Whether you prefer a rugged tool-watch aesthetic or a sleek, modern design, the right bezel insert can completely transform your build. Think about the Rolex Pepsi, or Rootbeer; the nickname comes from the color of the bezel insert which shows the impact it can add to a watch, so it’s something worth thinking over!


Types of GMT Bezel Inserts

When it comes to GMT bezel inserts, there’s a wide variety of options to suit different styles and functional needs. The category that everyone knows and loves: ceramic GMT bezel inserts. Ceramic inserts are highly scratch-resistant and are practically indestructible once installed on the watch. Their smooth finish and vibrant colors make them a favorite for modders looking to achieve a polished, high-end look. As you’d expect, the blue and red 24-hour insert is the most popular, but we have other colorways like Black/Gold for that refined two-tone look, or Black/Brown for a refreshing Root Beer theme.

 

Source: @modderire on IG

 

For those seeking a retro or vintage vibe, glass GMT bezel inserts offer a unique alternative. These inserts are made from Bakelite, a material that adds a nostalgic touch to your build. They come in two variations: one with a rounded, retro look that pairs beautifully with vintage-style dials, and another with a flat, modern look for a cleaner, more modern look. Both options provide a uniqueness that sets your watch apart from the usual GMT build.

 

Source: @watchmods_paris on IG

 

If you’re aiming for a more industrial or tool-watch feel, steel GMT inserts are an excellent choice. These inserts are non-rotating and feature 24-hour markers, making them ideal for fixed bezel designs. They come in two styles: a sloped version (like a pilot bezel) that pairs perfectly with low-domed crystals like the NMK304 or NMK305, and a slim version if you want your GMT build to be as sleek as possible. While they may be designed as fixed bezels, you can still have them rotate (if you prefer) by switching to a slightly slimmer 0.7mm bezel gasket. Steel inserts add a rugged but refined look to any build, so do consider these as one of your options!

 

Installation Tips for GMT Bezel Inserts

Installing a bezel insert is a straightforward process, here’s a quick guide to help you with the swap:

  1. Gather the Right Tools: You’ll need a bezel removal tool, 3M adhesive tape, and a clean workspace.

  2. Remove the Old Insert: Carefully pry out the existing bezel insert using the removal tool. Be gentle to avoid scratching the bezel or case. If possible, we recommend wedging a thin piece of plastic between the tool and the case as an extra precaution.

  3. Clean the Bezel: Ensure the bezel is free of dust, debris, and old adhesive before installing the new insert. While you’re at it, check that the bezel groove on the case is clean too so that the bezel can rotate smoothly once reinstalled.

  4. Install the New Insert: Install the bezel back onto the case. This is especially important if you need a crystal press to reinstall it, as doing so once the insert is already attached may cause damage. Add the new adhesive tape on the bezel, then, align the new insert carefully and press it into place, making sure that the markers are aligned with the dial. 

Need a more in-depth guide? Read here: How To Change Your Bezel Insert

 

Wrap Up

The NH34 movement has opened up exciting possibilities for Seiko modders, and the right bezel insert can take your GMT build to the next level. Just know that there are other options out there aside from ceramic inserts so you can plan a more unique mod!

Ready to work on your next GMT mod? We combined all the NH34-compatible parts in one place so you can easily choose your parts! Of course you can still browse around our website for more options - we have hundreds of premium mod parts to ensure that your watch will be as high-quality as possible.

Happy modding!

 

January 31, 2025 — Jeremiah A

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