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Custom Seiko Seamaster 300 MOD

Price range: $204.00 through $216.00

About this watch

Newly released by Wristmodding in this stunning Seiko Seamaster 300 MOD customization, after months of requests by our customers A 2-year warranty is included (the longest of the modding industry), free shipping to most locations, or alternative FedEx express delivery, coming with a stylish leather case with a complete toolset.
  • Our Seiko MOD Seamaster 300 comes in its perfect 41mm diameter, made of solid 316L stainless steel
  • Hand-assembled by professional watchmakers, no amateur watchmaking is involved in our shop
  • Rotating ceramic bezel with its iconic style (120 clicks, high-quality bezel action with NO back play)
  • Sapphire crystal for an unscratchable watch
  • Applied indices and handset with striking aged customization, powered by C3 lume, allowing night readability
  • Automatic Seiko NH35 caliber, with additional hand-winding and hacking, the premium version of the Japanese powerhouse, with 24 Jewels, 21,600 bph, 41 hours of power reserve, bi-directional rotor, for an advanced automatic movement made to run a lifetime that allows you to track an additional time zone
  • Stunning dial with a masterful matte finish, with 12 6 and 9 o'clock additional numerals, for a dial that has perfect reliability
  • Check our Submariner collection for more of our diver creations
  • This Modded Seiko Watch comes with full-fledged functionality and customization options, you can customize your watch at no extra cost by contacting support from the bottom right corner of our site
  • Screwed down crown and steel or glass back case
  • Optional S crown engraving available for a Seiko Seamaster 300 MOD that is a true jewel made with attention to every detail
  • Classic oyster-style bracelet, with solid links and micro adjustment
Make the watch of your dreams come to life at Wristmodding, the Seiko MODs shop run by professional watchmakers, and add this stunning Custom Seiko Seamaster 300 Edition to your collection [embed]https://youtu.be/FyIMem9FRNU[/embed]

100% Delivery guarantee

Feel free to return your watch for a refund if not satisfied (no questions asked) as per our policy.

Returns accepted

Feel free to return your watch for a refund if not satisfied (no questions asked) as per our policy.

2-year warranty

If your item is damaged, defective, or not as described by any means, we’ll replace it or fix it for free!

Masterfully crafted by professional watchmakers.

Years of experience, attention to details, and passion for the craft go into the making of our jewels.

Our custom Seiko watches are assembled only by professional horologists, with 15+ years of field experience.
Seiko MODs Shop 2025
Seiko MODs For Sale

Quality and value as our core drivers

We work very hard to offer the best value for our customers.

Nontheless, we do not compromise on quality. Only the highest grade materials at our disposal are used by our watchmakers, for luxurious timepieces at everyone’s reach, made to last a lifetime.

What customers say about us

We do our best to provide you the best experience ever
Excellent!
4.6
Based on
289 reviews
May 31, 2025
The watch has just arrived after what felt like forever, but in reality it was around 3 weeks. I opted for the GMT Bruce Wayne mod. After making adjustments to the bracelet and figuring out the GMT settings, I can't be more pleased with this beautiful time piece...
steven m
May 31, 2025
I am more than satisfied with whole process! From ordering to delivery. I even had an extra wish that was not included in offer and they was willing to help me out. I was contacting them under delivery time once or twice and I got response in 2-3 hours. I am very satisfied with my watch and I know what I’m talking about because I own 42 timepieces right now!
lavko Zenar
May 31, 2025
i bought the Seiko Skydweller in blue overall im happy about it links on the watch feels a bit cheap compared to other watches i have had in the same price range it says on their site on on the pictures that the watch has see though back case when mine came it didnt little dissapointing the package came before time
Rsky
May 31, 2025
Excellent Quality Product. Received it within one month. Selected the standard shipping option and it provides all the relevant tracking data. The watch is looking really good and will post an update after sometime.
Bimsara Chathuranga
Frequently Asked Questions

We offer worldwide free shipping, but you’ll ba able to also opt for express with an extra charge.

Amongst our carriers: DHL, USPS, Norway Post, NL Post, FedEx, UPS, etc…  we’ll coordinate the best shipping solution available depending on each order’s location

We surprisingly receive this question a lot, so we’re happy to address it. Cost efficiency and management, allowing the most amount of people possible to access this marvelous universe of MODs, was one of our pillar values when setting up WristModding. We prefer to play around with thinner margins but have a broader audience, as we wish to be a key player in popularizing MODs, but please note that we DO NOT compromise quality, and we only use the best and highest-quality components available for each of our creations.

Apart from our 2 years-warranty that covers any malfunctioning or defects, with watches/components replaced or fixed for free, all our shipments are insured, an insurance that we pay for and will be deducted from our payout, in case anything happens to the package from the moment we drop it off to the moment you receive it, or in case it gets lost.

Absolutely! Unless it’s a very peculiar request that might need extra charges (and engravings, custom dial printing, etc…), at no additional cost you can customize your timepiece by reaching out to us at the email below, or from the bottom right contact window.

Disclaimer
The watches sold on this website are custom-made products independently modified using components from various manufacturers. They are not affiliated with, endorsed by, or produced by Seiko Group Kabushiki Kaisha or any other entity. Any reference to the SEIKO brand is solely to identify the source of original components used in customization. This does not imply any relationship, authorization, or approval from Seiko Group Kabushiki Kaisha.
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Disclaimer
The watches sold on this website are custom-made products independently modified using components from various manufacturers. They are not affiliated with, endorsed by, or produced by Seiko Group Kabushiki Kaisha or any other entity. Any reference to the SEIKO brand is solely to identify the source of original components used in customization. This does not imply any relationship, authorization, or approval from Seiko Group Kabushiki Kaisha.