If you’re a watch enthusiast, you’re likely familiar with the concept of modding Seiko watches. What might have begun as a hobby for many has evolved into something more significant – the creation of custom timepieces. At SeikoModder.com, we explore the fascinating world of Seiko modding and the reasons behind its transition into the craft of building custom watches.

1. Accessibility of Parts

One of the key factors that have led to the evolution of Seiko modding is the accessibility of watch components. Seiko, a renowned Japanese watchmaker, has built a reputation for producing high-quality watch movements and parts. These components are easily obtainable in the market, making it convenient for watch enthusiasts to incorporate them into their custom watch projects.

2. The Inexpensive and Versatile Seiko NH Calibre Movement

At the core of this transformation is the Seiko NH calibre movement, a series of mechanical watch movements produced by Seiko Instruments Inc. These movements are celebrated for their affordability, reliability, and versatility, making them an ideal choice for modders.

The NH calibre movements are available in various models, each with its unique features and specifications. For instance, the NH35A is renowned for its robustness and accuracy, including a hacking feature that stops the second hand when setting the time and a hand-winding capability. It’s a popular choice for custom watch projects due to its reliability.

However, the NH35A is just one example of the NH calibre movements available for modding. With a range of movements to choose from, watch enthusiasts can customise the design and functionality of their timepieces to a remarkable degree.

3. The Market’s Desire for Luxury Styling at Affordable Prices

In the world of horology, there’s a growing demand for luxury styling at more affordable price points. Iconic luxury watch models like the Sub, Santos, Nautilus, and Royal Oak have always been admired for their exquisite designs and craftsmanship. However, their hefty price tags make them unattainable for many watch aficionados.

Seiko modding offers an elegant solution to this problem. By customising what many now callSeiko mods with luxury styling in mind, enthusiasts can recreate the look and feel of high-end timepieces without breaking the bank. For example, a Seiko modder can transform a standard Seiko diver’s watch into a timepiece that closely resembles the iconic sub, complete with a ceramic bezel, sapphire crystal, and a custom dial. Seikomodders can also buld a custom Sub from the vast array of aftermarket parts available on the web.

Customisation not only allows individuals to enjoy luxury styling at a fraction of the cost but also offers a high degree of personalisation. Modders can choose their preferred materials, colors, and design elements, creating a watch that is uniquely their own.

4. Price Reduction in Machining Items

One of the often-overlooked reasons for the evolution of Seiko modding into custom watches is the decreased cost of machining items like lasers, mills, and lathes. The availability of these tools has made machining practices accessible to enthusiasts who wish to hone their craft.

This access to machining equipment empowers modders to take their custom watch projects to new heights. They can craft intricate dials, cases, and hands with precision, enabling the creation of unique, high-quality timepieces. The ability to work with machining tools has opened up a world of possibilities for modders and watchmakers alike.

5. Addressing the Concern of Watch Theft

Another fascinating aspect of the transition from Seiko modding to custom watches is its response to the concern of watch theft. Owning a high-end luxury watch, such as a Rolex or a Patek Philippe, can make one a target for potential thieves. In some unfortunate situations, watch owners may be forced to part with their timepieces due to theft.

Custom or modified Seiko watches offer an intriguing alternative. These watches are designed to emulate the styling of high-end luxury timepieces but come at a lower price point. This makes them less appealing to potential thieves. In the event of a mugging situation, an individual can part with their custom Seiko watch without incurring the significant financial loss associated with losing a high-end luxury watch.

6. The Diversity of the Custom Watch Market

If you’re not a modder and don’t want to take on the hassle of learning a new hobby, but you’re interested in acquiring one of these custom watches, the market on platforms like eBay and Etsy is awash with options. However, the quality of these watches can vary significantly from one vendor to another.

Some vendors may cut corners in terms of craftsmanship, neglecting essential assembly steps or using subpar components. Conversely, others uphold the highest levels of quality control, ensuring that every custom watch they produce meets exacting standards. When selecting a vendor for custom watches, it’s crucial to do thorough research, read reviews, and/or seek recommendations from experienced modders and watch enthusiasts.


The evolution of Seiko modding into custom watches is a remarkable journey driven by the accessibility of parts, the affordability and versatility of the Seiko NH calibre movement, the increasing demand for luxury styling at affordable prices, and a possible response to concerns regarding watch theft. Whether you’re a modder or a buyer, the world of Seiko custom watches offers a world of possibilities.

However, it’s important to remember that not everyone shares the same taste in watches, and what may be a beautiful creation to one may be unappealing to another. The world of Seiko modding and custom watchmaking is as diverse as the watch enthusiasts who participate in it. Ultimately, it’s a testament to creativity, craftsmanship, and the passion of those who turn their love for timepieces into wearable works of art.

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