The Jacques Bianchi JB300 is a modern steel dive watch that the maker presents as a reinterpretation of its early-1990s military-diver design. Its published specification is substantial on paper: a 42 mm case, Swiss SoProd P024 automatic movement, sapphire crystal and 300 m water resistance. The available material does not document independent hands-on testing, so this is a specification-led look rather than a review of real-world comfort, timing, legibility or diving performance.
What the JB300 is—and what its military story establishes
Jacques Bianchi Marseille describes the JB300 as the successor or reinterpretation of a military model from the early 1990s, and says development of the new watch took more than two years. The maker calls it a tribute to its history and military heritage. Those are the brand’s claims: the product information cited here does not provide an independently documented military procurement record or verify the original watch’s service history.
That distinction matters when assessing the re-edition. The connection is a stated design and brand-history reference, not proof that the current watch is an exact reproduction of a documented military-issued model.
JB300 published specifications
| Feature | Maker-published detail |
|---|---|
| Case | 42 mm, 316L stainless steel; screwed crown at 3 o’clock. Jacques Bianchi Marseille |
| Movement | Swiss SoProd P024 automatic mechanical movement. Jacques Bianchi Marseille, JB300 Blue |
| Crystal | Sapphire. Jacques Bianchi Marseille |
| Dial and display | Black “Maxi Dial” with 24-hour markings; the brand describes luminous indices with green emission. Date, hours, minutes and seconds are listed functions. Jacques Bianchi Marseille; Jacques Bianchi Marseille, JB300 Blue |
| Bezel | Oversized, unidirectional bezel with a Super-Luminova luminous pearl, according to the brand. Jacques Bianchi Marseille |
| Water resistance | 300 m / 30 bar, as published by the manufacturer; no independent pressure-test result is established here. Jacques Bianchi Marseille |
| Lug width and straps | 20 mm lug width; black tropical-style rubber and black Perlon strap options are described. Confirm fit for the exact variant before buying a third-party strap. Jacques Bianchi Marseille |
These figures describe the standard JB300 as presented by the maker, not independently measured performance. A 300 m rating is a manufacturer specification; it should not be treated as evidence of a particular watch’s current condition or suitability for a specific dive without following the manufacturer’s use and maintenance guidance.
Quick wins for a faster PC:
Clear out junk files and repair common Windows errorsFree Scan →Scan for outdated or missing drivers - takes under a minuteDriver Scan →#1 Best Overall
- Stainless steel case 43mm diameter x 12mm thick; Black dial; Luminous hands and hour markers
- Japanese quartz movement, PC32 Caliber; Assembled in Japan; SR626SW battery included; Watch weight: 170 grams
- Stainless steel band, 185mm L x 22mm W; Band is adjustable by adding/removing links; Fold over safety clasp
- Flame Fusion crystal; Screw down crown; Uni-directional stainless steel bezel with black top bezel ring; 100 meter water resistant: Suitable for recreational surfing, swimming, snorkeling, sailing and water sports. Not suitable for diving
How to read the design and specification on paper
Case size and strap fit
The published 42 mm diameter puts the JB300 in a size category that may feel prominent, but diameter alone does not establish how it wears. The available product details do not give enough information here to assess thickness, lug-to-lug length or wrist comfort. The listed 20 mm lug width gives a useful strap-sizing reference, though compatibility should still be confirmed against the exact JB300 variant.
Dial, bezel and movement
The black dial combines a 24-hour marking scheme with date and standard time indications. Jacques Bianchi also specifies luminous indices and a luminous bezel pearl; no independent nighttime legibility or lume-duration test is available. The SoProd P024 is identified by the maker as an automatic Swiss mechanical movement, but the cited product material does not establish measured accuracy or power reserve.
Rank #2
- BUILT FOR TOUGH, ACTIVE DAYS Handle outdoor routines and daily wear with confidence. 42mm 316L stainless steel case delivers strength and durability, making it a reliable rugged option for men who need performance in real-world conditions.
- RELIABLE TIME YOU CAN TRUST DAILY Stay on track from work to weekend activities. Swiss-made Ronda 515 quartz movement delivers accurate, consistent timekeeping you can depend on throughout your day.
- DESIGNED FOR WATER AND ACTIVE USE Move from daily wear to time in the water with ease. Unidirectional rotating bezel helps track time during swimming and outdoor activities, making it a practical dive watch for active lifestyles.
- READY FOR SWIMMING AND WATER EXPOSURE Built for everyday wear and ready for swimming or time in the water. Water resistance up to 100M (330FT) supports underwater use and active environments without added stress. The best gift for an active man anyday.
- PRACTICAL DESIGN FOR EVERYDAY CONVENIENCE Keep your day organized without distraction. Date display adds quick access to daily information while maintaining a clean, easy-to-read dial for regular use.
Water-resistance rating
The brand publishes 300 m / 30 bar water resistance. That is a specification, not a result from an independent test covered here. Water resistance can depend on condition and correct crown operation, so the printed rating should not substitute for checking the watch’s instructions or having its seals tested when appropriate.
Standard JB300 variants and the separate Profonde
The black and Blue models are standard JB300 variants; the maker’s available pages support distinguishing them by dial color and variant-specific availability. Do not transfer the stock status of one dial to the other.
Free tools Windows power users keep installed
One-click scans. No signup required.
Rank #3
- Black dial, Stainless steel band
- 42mm stainless steel case
- Screw-down crown
- Mineral crystal
- 200 meter water resistant
| Model | What the cited maker page establishes | Availability qualification |
|---|---|---|
| JB300 black | Standard steel JB300, black dial. Jacques Bianchi Marseille | The official page labels the limited edition sold out; status can change. Jacques Bianchi Marseille |
| JB300 Blue | Blue-dial standard variant. Jacques Bianchi Marseille | The page showed “LAST PIECES” and €1,125 when indexed. This is a time-sensitive, variant-specific snapshot, not confirmation of current stock or price. Jacques Bianchi Marseille |
| JB300 Profonde | Distinct titanium collaboration with Deepsea.EDC, announced as a 150-piece edition. It should not be treated as the same configuration as the standard steel JB300. Jacques Bianchi Marseille | The announcement listed preorder opening on 30 October 2025 and delivery from 5 January 2026; both dates have passed. Current stock is not established by that announcement. Jacques Bianchi Marseille |
Is the JB300 sold out, and what should you check before buying?
Availability is variant-specific and volatile. The black JB300 page states that its limited edition is sold out. The Blue page’s indexed “LAST PIECES” message and €1,125 price are not a live guarantee. Check the relevant official product page directly for the exact variant’s current status and price before making plans to buy.
- Confirm whether the listing is for the black, Blue or Profonde version; their materials and edition identity are not interchangeable.
- Verify the live price, stock status and included strap on the exact listing.
- If changing straps, confirm 20 mm compatibility with the specific watch and the strap’s spring-bar arrangement.
- For use in water, rely on the maker’s instructions and the individual watch’s condition, rather than treating a published rating as a recent pressure test.
What this review can—and cannot—say
The maker’s published specifications establish the JB300’s stated case material and size, movement, crystal, display features, strap width and water-resistance rating. They do not establish how the watch feels on wrist, whether its bezel action is satisfying, how accurately a given example keeps time, or how it performs underwater. No independent test results for those qualities are available here, so those judgments should not be inferred from the specification sheet.
Quick Recap
Best Value
- 【UNSTOPPABLE SOLAR POWER】Powered by advanced solar technology, the watch charges from any light source—natural sunlight or indoor lighting. A fully charged battery provides up to 180 days of standby time. Say goodbye to frequent battery changes and embrace eco-friendly, limitless energy for your outdoor adventures.
- 【300M PROFESSIONAL DEEP DIVING】Engineered for extreme pressure, this watch is water-resistant up to 300 meters (1000 Feet). Featuring a high-performance screw-down crown and specialized sealing gaskets, it is fully capable of professional diving, spear-fishing, and high-intensity water sports.
- 【RUGGED 316 STAINLESS STEEL】 The watch body is crafted from high-density 316 stainless steel, with hardened mineral glass providing excellent impact and scratch protection - perfect for adventurous environments.
- 【SUPER-LUMINOUS & ROTATING BEZEL】Features a classic unidirectional rotating bezel for precise elapsed time tracking. Combined with high-definition luminous hands and indices, ensures effortless readability in deep-sea darkness or nighttime missions.
- 【Sturdy and durable outdoor design】 Suitable for divers and explorers. With a case diameter of 45.8mm, strapbold dial design, 24mm flexible silicone watch, and weighing 198 grams, this men's diving watch provides a strong presence on the wrist, offering both durability and a sense of style for daily wear.
Rank #4
- Stainless steel case 47mm diameter x 14.44mm thick; Exhibition case back; Black dial; Luminous hands and hour markers
- NH35A Japanese Automatic movement, 24 jewel; Assembled in Malaysia; Watch weight: 310 grams
- Stainless steel band, 215mm L x 22mm W; Band is adjustable by adding/removing links; Fold over safety clasp
- Mineral crystal; Screw-down crown; Unidirectional stainless steel bezel with black top bezel ring; 300 meter water resistant: Suitable for professional marine activity and surface water sports. Suitable for diving.
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.
