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Your Perfect Watch, Your Unique Style

Personalized timepieces by NMAWatchGuy.

See more custom watches below

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Crafting Unique Timepieces with Passion and Precision

At NMA Watch Guy, we transform ordinary watches into extraordinary works of art. Our specialty lies in custom Seiko mods, where we blend the reliability of Seiko with unique, personalized touches. Whether you're looking for a one-of-a-kind creation or need expert repair services, our passion for horology ensures that each timepiece leaving our workshop is a masterpiece.

Key Services
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Custom Seiko Mods

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Expert Watch Assembly

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Professional Repair & Maintenance

Timeless Elegance for Her

Introducing our new line of custom women’s watches—crafted with care, designed to inspire. Each piece reflects a perfect blend of sophistication, functionality, and individuality, because your watch should be as unique as you are.

Explore our curated collections

Unique timepieces born from service, craft, and devotion

Seiko Daytona

Race against time with our precision-engineered Daytona homage.

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Seiko Nautilus

Embrace luxury with our elegant Nautilus-inspired designs.

Seiko Diver

Plumb the depths with our robust and reliable diver mods.

Seiko Sub

Dive into timeless style with our submersible-inspired mods.

Seiko GMT

Navigate multiple time zones with our worldly GMT creations.

Seiko Yachtmaster

Set sail in sophistication with our nautical Yachtmaster mods.

Tactical Timekeeping

As a retired Army Staff Sergeant with a decade of service, NMA Watch Guy approaches watchmaking with the same dedication and attention to detail that guided his military career. Each watch is a testament to precision and craftsmanship.

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Our Most Popular Creations

Discover the timepieces that have captured the hearts of watch enthusiasts. Each of these best-sellers represents the pinnacle of our craftsmanship, blending classic Seiko reliability with unique, custom modifications.

The Timeless Appeal of Custom Watches

Discover why watch enthusiasts are turning to custom creations for their timekeeping needs. At NMA Watch Guy, we bring your unique vision to life.

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Stand Out from the Crowd
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Your watch is as unique as you are. Express your individuality with a timepiece that reflects your personal style and taste.

Built for Your Needs
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​Choose the features that matter most to you. From specific complications to preferred materials, your watch is tailored to your lifestyle.

Precision in Every Detail
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Each custom watch is meticulously crafted, ensuring superior quality and attention to detail that surpasses mass-produced timepieces.

Lasting Value
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A custom watch is more than an accessory—it's an investment. Enjoy a high-quality timepiece that stands the test of time.

  • How are these watches made?
    These watches are constructed using Seiko NH-style movements and are meticulously handcrafted by me from individual components sourced through a reliable supply chain. Each timepiece is manufactured in my workshop, where I personally oversee the quality control process to ensure the highest standards are met. I use only sapphire crystals and 904L and 316L steel for cases.
  • How long does it take to build and ship my watch?
    Each watch is expertly custom-built and generally requires a completion time of 2 to 3 weeks. Upon finalization, I will dispatch your watch via an express service, and you will receive a tracking number to monitor the shipment at every stage. This approach ensures swift and secure delivery directly to your doorstep.
  • Are these watches waterproof?
    My watches are rated to 5ATM, which means they can withstand pressures equivalent to a depth of 50 meters (approximately 164 feet). This rating makes them suitable for everyday activities such as hand washing, light rain, and splashes of water. However, I advise against using them for intense swimming or exposing them to hot water, as this may compromise the seals. While they can handle some moisture, avoiding full immersion will help maintain their appearance and ensure optimal performance.
  • Are these covered by a warranty?
    Certainly! Here’s a more detailed overview of my watch warranty and service commitment: Warranty Coverage: Each watch comes with a comprehensive one-year warranty that safeguards against any defects in movement or craftsmanship. This warranty ensures that you can enjoy your timepiece with confidence, knowing that I stand behind the quality of my work. Repair and Replacement: In the event that you experience any issues with your watch during the warranty period, I will promptly take care of repairs or provide a replacement at no cost to you. My goal is to ensure that you are completely satisfied with your purchase and that your watch remains in excellent condition. Post-Warranty Support: Even after the one-year warranty has expired, I am dedicated to supporting my customers. Should you encounter any problems—regardless of size—I encourage you to reach out. I am here to assist you with repairs, maintenance, or any inquiries you may have. Your satisfaction remains my priority, and I will strive to resolve any issues to the best of my ability. Commitment to Quality: I take pride in the craftsmanship and quality of my watches. Each timepiece is designed not only to be stylish and functional but also to stand the test of time. Your happiness with your watch is paramount, and I continually seek to uphold the highest standards in my work. If you have any additional questions or need further assistance, please feel free to ask!
  • How do I set my GMT?
    NOTICE: Read these instructions in whole. They will give you a good understanding of the operation of the Seiko Calibre NH34 (4R34) movement, and reduce any potential damage and failures in operational functionality. Warning: Do not operate the date or the GMT quick set from the crown between the hours of 9pm and 3am as you risk rendering the date change mechanism useless. If you don’t know the time, don’t change the date. More on this to follow. Manual Operation of the movement is controlled from the crown, some may call this a winder. The crown has three operating positions that control the different functions and complications of the Cal. NH34 (movement). Selecting the desired operating position is achieved by pulling the crown out gently. If you pull it too far, aiming to achieve the second position (date operation) you can simply push it back in and gently pull again. Hand-winding – Calibre NH34 (movement) The first operating position of the Calibre NH34 (movement) is the hand winding function. The first position is where your crown is at rest. This can vary depending on your watch’s design, there are two options. You have a sports watch where the crown screws closed to create the water tight seal. The first positions is found by unscrewing the crown until it is no longer engaged with the locking mechanism on the case. If your watch does not feature the screwed crown. The closed position (most pushed in) is the first operational position. The first operational position is where you can hand-wind your watch. Essentially, this is putting power into the reserve. Approximately forty hand-winds of the crown in a clockwise rotation in this position will supply the reserve with a full supply. This will last approximately forty-one hours if unworn. If you intend to wear your watch everyday, your watch will require no further winding as your movement will supply power through the autowinding mechanism. Date and GMT Quickset – Calibre NH34 (movement) The second operating position of the Calibre NH34 (movement) controls the quickset of the day date and GMT complication. Warning: Do not operate the date and GMT quick set from the crown between the hours of 9pm and 3am as you risk rendering the date mechanism useless. If you are unsure of the time your watch is displaying with regards to the 24-hour date function, skip to next, the third operational position, and follow instructions to change the time so you are sure to be outside this region of operation where your risk damage to your timepiece. Date: Changing the date is done by turning the crown anti-clockwise. You will see the date wheel complete a part rotation and the next number will drop into view. GMT: This movement has an additional hand (a fourth hand). This is a GMT hand and tracks the time in a second location. Changing the time of your desired second location is done by turning the crown clockwise. You will see the GMT hand complete a part rotation. Each click of the hand rotates the GMT hand one hour. This can be operated like so, until the desired second location time is selected. It will appear as half an hour on the dial as the GMT hand takes twenty-four hours to make one full rotation of the dial. The hour hand makes two full rotations in a twenty-four hour period. Setting the Time and Hacking – Calibre NH34 (movement) The third operating position of the Cal. NH34 (movement) allows the user to set the time and affect the second hand hacking (stopping) function. The third and final operating position can be reached by pulling the crown out to the final position. You will notice when are in this position, as the second hand will stop moving. This is the hacking feature of your Cal. NH34. The crown rotated in a clockwise position will move the hour and minute hands in a clockwise rotation. You should set the time by using the clockwise rotation for the bulk of the movement. It is understandable that you may miss the time that you wish to set your watch to. In this case, micro adjustments to the time in an anti-clockwise rotation are fine, but if you move over a few hours past, it is recommended that you continue the clockwise rotation until you achieve a full rotation. DON’T: Turn your crown anti-clockwise in the hope that the date will go backwards. It will not. You will not be happy with the results!
  • How do I use the chronograph function (Daytona or Other)?
    Start the Chronograph In most (but not all) cases, a chronograph watch will have two pushers on the righthand side of the case. Press the top pusher (located at 2 o’clock) to begin timing an event, and you’ll notice the seconds hand (usually centrally mounted on the dial) start to sweep or tick. Stop the Chronograph Use the same (top) pusher to stop the chronograph when the event ends. This button is usually operated with the index or middle finger with the watch case supported on the other side by the thumb. Read the Elapsed Time Chronograph watches display the time measured on the stopwatch separately from the current time of day. The format can differ depending on the design and movement inside, with some only counting up to 30 minutes while others have the ability to measure up to 12 hours. The seconds, minutes and hours for the chronograph are (usually) read on separate subdials. For example, let’s say your watch has a 30-minute counter/subdial at 3 o’clock and a running seconds hand at 9 o’clock. If you’ve been timing an event for 15 minutes and 20 seconds, the sub-dial at 3 o’clock will show those 15 elapsed minutes, while the centrally mounted seconds hand will show 20 elapsed seconds. The seconds hand at 9 o’clock will continue to sweep, as it’s measuring the time of day — not the time on the stopwatch. Reset the Chronograph Finally, the bottom pusher (around 4 o’clock) resets the chronograph to zero. Editor’s note: A few variations will function a bit differently. The flyback allows you to reset the chronograph without first stopping it. A monopusher chronograph only uses a single button for all functions — stop, start and reset. A split-seconds or rattrapante, a particularly complicated type of chronograph, allows you to measure two separate events simultaneously. What Not to Do With a Chronograph There are a few things it’s probably advisable to avoid with your chrono. Don’t worry about pressing the reset button when the chronograph is running: it won’t do anything unless it’s a flyback chronograph and made for it. If you press it really hard, of course, you could break it. Some people worry about whether it’s OK to leave a chronograph running continuously. While it’s not strictly bad for the watch, it will take more power from the mainspring (reducing its power reserve) and put more wear on some components. Lastly, is your chrono built for action or wet environments? Even if a chronograph watch is made for taking in the water (maybe doubling as a dive watch), you’ll want to double check with the manufacturer that the pushers can be safely operated underwater before doing so.

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