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SEIKOSUB EDITION VINTAGE OPEN HEART MILSUB LEATHER MOD
Note: This is a custom-built timepiece using TMI Seiko movement. Monomods is not affiliated with any watch brand.
$374.95 USD
🔒 Money-Back Guarantee & 180-Day Buyer Protection On All Credit Card Purchases
Description & Specifications
INFO
The Vintage Milsub Open Heart Mod reimagines the iconic military dive watches of the 1960s and 1970s through the lens of modern Japanese craftsmanship. Its matte black dial with an open-heart cutout reveals the rhythmic motion of the NH35 automatic movement, embodying both strength and soul. The brushed stainless steel case and black bezel reflect utilitarian purpose, while the aged brown leather strap adds vintage warmth and character.
Crafted for resilience and precision, it features a sapphire crystal with anti-reflective coating, luminous markers, and a 42-hour power reserve. With its 40mm case and balanced proportions, this timepiece fuses heritage and functionality—made for those who value authenticity and timeless design.
SPECS
| Specification | Details |
|---|---|
| Case Material | Stainless Steel |
| Strap | Vintage Leather |
| Case Diameter | 40mm |
| Lug to Lug | 47.5mm |
| Lug Width | 20mm |
| Movement | Seiko NH35 Automatic |
| Glass | Sapphire, Anti-Reflective |
| Power Reserve | 42 Hours |
| Accuracy | ±7 Seconds per Day |
| Vibration Frequency | 21,600 vph |
| Features | Open-Heart Dial, Long-Lasting Lume, Brushed Case |
Return Policy
Enjoy peace of mind with our 30-day money-back guarantee. If your purchase doesn’t meet expectations, simply return it within 30 days for a full refund—no questions asked. Shop confidently, knowing we’re committed to your complete satisfaction.
2 Years Warranty
Enjoy peace of mind with our complimentary 2-year extended warranty. Every watch is protected against manufacturing defects to ensure long-term reliability and satisfaction.
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Hand-assembled with care from sapphire crystal, ceramic bezels, leather or stainless steel straps, and Luminova — All powered by precise Japanese movements.
Your signature timepiece
Unlike mass-produced mods that cut corners, MONOMODS Watches delivers handcrafted, precision-built timepieces using only premium components and movements.
| What Sets Us Apart |
|
|---|---|
| Handcrafted by professionals | ✔ |
| Tested for waterproof resistance | ✔ |
| Strict quality control & tested performance | ✔ |
| Fast shipping & guaranteed delivery | ✔ |
| Premium movements & high-grade parts | ✔ |
| Warranty-backed quality you can trust | ✔ |
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Frequently asked questions
Are the watches waterproof?
Our watches have a 3ATM water resistance, meaning they handle splashes and rain but are not suitable for swimming or diving.
What warranty do you offer?
Every watch includes a 2-year international warranty covering mechanical defects and craftsmanship.
What movement does the watch use?
Each timepiece is powered by a reliable Japanese movement such as the NH34, NH35, NH70, or VK63 renowned for their precision, durability, and smooth performance. We carefully select these proven automatic and hybrid calibres to ensure every watch delivers lasting accuracy and mechanical excellence.
How long will delivery take?
Orders typically arrive within 5–14 days with free tracked shipping. You’ll receive tracking updates once your watch ships.
Can I return or exchange my watch?
Yes, you have a 30-day money-back guarantee from the day you receive your order. Contact support@monomods.com to start a return.
Can I request custom adjustments or strap changes?
Absolutely. If you’d like a different strap, bracelet, or color not listed on our site, contact our support team before ordering, and we’ll personalize it for you where possible.
Are you affiliated with Any other brands?
No. We’re an independent brand using authentic Japanese movements and custom components to create unique handcrafted timepieces.
What materials are used?
All watches are made with premium 316L stainless steel, sapphire crystal glass, and high-grade ceramic or alloy components for durability and clarity.
Do you offer engraving or personalization?
Yes. We offer custom engraving and personalization options to make your timepiece truly yours. Whether it’s a name, date, or special message, our team can engrave it discreetly on the caseback. Simply contact support@monomods.com before or after your order, and we’ll guide you through the options available.
What happens if my watch arrives damaged?
In the rare case your watch arrives damaged or defective, don’t worry — you’re fully covered. Contact support@monomods.com within 7 days of delivery, and we’ll arrange a replacement or repair at no cost. Every watch is protected under our 2-year warranty and 30-day money-back guarantee for your peace of mind.