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Repair common Windows errors and clear accumulated junk for a smoother, more stable PC - no reinstall needed.Free scan · no reinstallThe Mauron Musy GMT Sport MU04 pairs an automatic GMT watch with the brand’s nO-Ring mechanical case-sealing system. Mauron Musy rates the MU04-103 to 300 metres / 30 ATM and says the system seals without rubber gaskets; the available sources establish the manufacturer’s design and rating, not an independent water-resistance test. The “100% Swiss” description refers to the “Swiss Crafted” label, which the brand defines as 100% made in Switzerland.
What the Mauron Musy GMT Sport MU04 offers
The MU04 is an automatic travel watch built around the MM01-GMT calibre. Its central hour and minute hands show local time, while a separate 24-hour GMT indication tracks a second time zone. The dial also has small seconds at 9 o’clock and a semi-instantaneous aperture date.
The current MU04-103 listing specifies a 55-hour power reserve and a frequency of 28,800 vibrations per hour (4 Hz). Mauron Musy describes the movement as made for the brand by Manufacture La Joux-Perret; its 2020 press release calls it an exclusive self-winding calibre made in-house by La Joux-Perret. That wording identifies the maker without implying that Mauron Musy owns the movement manufacturer.
Dial and display details
The brand describes a cast-iron-textured dial with polished champlevé markers and cartouches, luminescent hybrid-ceramic numerals, and polished hands with luminous tips. A 60-minute scale runs around the sloping inner bezel. Five apertures reveal the date disc, while the small-seconds display is styled, according to the brand, as a speedometer. These are construction and design descriptions, not independent findings about legibility.
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How the nO-Ring sealing system is described
Mauron Musy attributes the MU04-103’s 300 m / 30 ATM rating to its patented nO-Ring system. The brand says the case components compress mechanically to create a direct seal, without a gasket or polymer. The Federation of the Swiss Watch Industry’s 2023 article similarly says that “no fewer than 36 components ensure the case is perfectly water-resistant to 300 metres without the need for any gaskets.” That is the Federation’s description of the design; neither it nor the manufacturer’s product listing is an independent test report.
The component counts differ by source and context. The individual MU04-103 product page lists 29 components in the case specification, while the collection page describes 36 elements in the titanium case’s sealing system and the Federation article refers to 36 components. The available descriptions do not explain how the counts relate, so they should not be treated as interchangeable.
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- Super BGW9 Luminous / 3D Index
- Whole Case, Bracelet and Buckle is Titanium Grade 2
- High Beat 28,800 Bph (4 Hz)
- 200M Meters Water Resistant
- 12 Months Warranty
The brand says the design avoids the specific maintenance involved in replacing rubber gaskets, and that professional watchmakers can service the system. It recommends contacting an authorized partner so warranty terms can be taken into account; the gasket-free claim should not be read as a promise that the watch needs no servicing.
Case, dimensions, and straps
The MU04-103 listing specifies a 44 mm Grade 5 titanium case, sapphire crystal, and transparent sapphire caseback. It gives a standard 22 mm spring-bar attachment and lists FKM rubber and leather straps; the current model page says each watch comes with one of each. A 22 mm FKM rubber strap is a useful search description for a replacement, but check the exact reference, buckle, and fit before ordering.
Rank #3
- Precise GMT Dual-Timekeeping: PAGANI DESIGN 40mm men’s watch features a tactical movement for consistent timekeeping, ideal for business trips, cross-timezone travel, and daily use. The GMT function simplifies tracking two timezones, catering to frequent travelers or those connecting with overseas contacts
- Equipped with adjustable Triple Bead/Jubilee Stainless Steel Bracelet: Triple Bead Bracelet adopts sturdy three-link structure,The bracelet comes with screw-in links and a free small screwdriver for easy resizing (simple operation even for beginners). Safety folding buckle ensures secure fit after adjustment, providing comfortable all-day wear.
- Self-winding Automatic Movement: Reliable performance requires daily wear (8+ hours) or 20-30 manual crown winds (clockwise rotation to kickstart). The watch is built with 316L stainless steel case (durable and anti-corrosion) and scratch-resistant sapphire crystal with anti-reflective convex lens (effectively reducing glare, protecting dial from scratches), merging durability with modern style for long-term use
- 100M/10Bar/10ATM Water Resistant: Adopts classic screw-down crown with double waterproofing system (shoulders on both sides integrated into center case), tested by professional precision instruments for reliable water resistance. Suitable for swimming and diving. Cooperating with the luminescent hands and markers, it can meet the needs of low-light or underwater use, ensuring clear reading in various environments
- Package Includes: 1 x Pagani Design GMT PD-1662 Watch, 1 x Elegant Watch Box, 1 x Brand Card, 1 x User Manual, 1 x Fiber Cloth, 1 x Small Screwdriver (for bracelet resizing). We provide 24/7 online customer service—feel free to leave messages for any product questions (movement use, bracelet adjustment, waterproof maintenance, etc.), and we will reply promptly to ensure a satisfactory shopping experience
What “100% Swiss” means here
The manufacturer’s 2020 press release defines the inscription “Swiss Crafted” as meaning 100% made in Switzerland. The Federation of the Swiss Watch Industry’s 2023 article also describes Mauron Musy timepieces as labelled Swiss Crafted (100% made in Switzerland). These are the brand’s definition and the Federation’s description of the label, not an independent audit of the origin of every component.
Current variants and listed prices
Mauron Musy’s collection page listed the following GMT Sport variants and prices on 7 October 2026. The page marked them “Last few pieces available”; both stock status and prices can change.
Rank #4
- GMT - With its sophisticated tonal GMT index and prominent red triangle GMT hand, this watch can be set to track a second time zone.
- Stainless Steel - The durable stainless-steel case and bracelet are resistant to corrosion, rust, and daily wear and tear.
- Date Window - Easily track the date in a dedicated window beside 3 o'clock.
- Thoughtfully Detailed - This watch features a vintage-style domed acrylic crystal, a lustrous sunray dial, and faceted markers.
| Reference | Listed price |
|---|---|
| MU04-102 | CHF 15,400 |
| MU04-103 | CHF 15,400 |
| MU04-202 | CHF 16,600 |
| MU04-203 | CHF 16,600 |
Confirm the current price, availability, and configuration with Mauron Musy or an authorized retailer before buying.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Warranty and service considerations
Mauron Musy’s 2020 press release lists a five-year guarantee, and the Federation’s 2023 article reports a five-year warranty. Current model pages advise buyers to work with an authorized Mauron Musy partner so the warranty can be taken into account and extended. Because the guarantee period and extension conditions may change, confirm the applicable terms for the specific watch and purchase date with the brand.
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- 38mm stainless steel case
- Day date window on dial
- Acrylic lens
- Synthetic rubber attachment
- Water resistant to 50m (165 ft): In general, suitable for short periods of recreational swimming, but not diving or snorkeling
Who should consider the MU04 GMT Sport?
The specifications make the MU04 a fit to investigate for someone seeking an automatic GMT with a mechanical, gasket-free case design and a 300 m manufacturer rating. Its 44 mm diameter, luxury price, and specialized service considerations matter as much as the headline water-resistance figure. The available sources do not establish independent pressure-test results, measured timekeeping, wrist comfort, or real-world legibility, so those questions require evidence beyond the published specifications.
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Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
