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What is the Blancpain Fifty Fathoms Tech Ocean Commitment IV?
Often shortened to Tech BOC IV or BOC IV, this is a limited-edition Fifty Fathoms built around Blancpain’s Tech Gombessa design language. Its reference is 5029A 12B30 64A. The watch combines a large titanium case, a black dial and rubber strap, and a date display with a standard unidirectional dive bezel.
Blancpain’s US product page displays a price of $26,000 and notes that the price may vary according to whether the watch is supplied with a pin buckle or folding clasp. That page currently shows the model as sold out; both the price and stock status are specific to the US listing and can change. See Blancpain’s US product listing.
Specifications
| Specification | Blancpain’s stated details |
|---|---|
| Reference | 5029A 12B30 64A |
| Case | Titanium; 45.00 mm diameter and 14.10 mm thick |
| Water resistance | 30 bar |
| Crystal and case back | Domed sapphire crystal; sapphire case back |
| Dial | “Absolute black,” with luminescent markers |
| Bezel | Unidirectional, with black ceramic inlay |
| Other case and display details | Helium valve; central lugs; date |
| Strap and fastening | Integrated black rubber strap; interchangeable strap; pin buckle listed in the specifications. Blancpain notes that price may vary with pin buckle or folding clasp. |
| Movement | Automatic caliber 1315A |
| Power reserve | 120 hours |
| Movement details | 4 Hz, 35 jewels, 227 components, 5.65 mm thick, silicon balance spring |
| Edition and contribution | Blancpain states a 100-piece limit and €1,000 allocated per watch sold to the Blancpain x Sulubaaï Marine Research Center, for a stated total fund of €100,000 |
| Official US listing | $26,000 displayed; marked sold out when the page was accessed in 2026 |
The case, water-resistance, and reserve figures come from Blancpain’s current official product specifications; movement details are on its more detailed English product page. US product specifications · English product page.
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- Case Size: 44.00 mm, Band Width: 22 mm, Case Thickness: 15.29 mm
- Swiss Automatic Movement, HMSD (Hour, Minute, Second, Date), 316 stainless steel case, power reserve up to 80 hours
- Water-resistant up to a pressure of 60 bar (600 m / 2000 ft)
- see-through caseback, caseback with sapphire crystal, screw-down crown and caseback, ceramic bezel ring, helium valve, anti-clockwise rotating bezel
- Domed scratch-resistant sapphire crystal with antireflective coating, Super-LumiNova dial
How it differs from the Tech Gombessa
Blancpain describes the BOC IV as adopting the Tech Gombessa design, but the two models do not share the same dive-timing setup. The BOC IV has a unidirectional bezel and date. The Tech Gombessa was designed around a three-hour bezel and a dedicated dive-time hand to track immersion periods of up to three hours. That makes the BOC IV a design relative, not an identical timing instrument. Blancpain’s Tech Gombessa announcement.
What Blancpain says the conservation contribution supports
Blancpain says €1,000 from each BOC IV sold will go to the Blancpain x Sulubaaï Marine Research Center, with a total fund of €100,000 for the 100-piece edition. The brand says the center was inaugurated on 7 February 2025 and describes it as an extension of its Sea Academy program. These are Blancpain’s stated allocation and project descriptions; the cited pages do not independently verify conservation outcomes or audit the resulting impact. Blancpain on Ocean Commitment IV.
Rank #2
- Powered by the Orient F922 Automatic / Hand-Winding / Hacking Movement
- Case Dimensions: 41.8 mm Diameter, 47 mm Lug to Lug Length, 12.8 mm Thick, 22 mm Lug Width
- Feature: Sapphire Crystal, Day, Date, Screwdown Crown, 120-Cliick Unidirectional Bezel
- Dial Color: Red
- Water resistant 200m (660ft): in general, suitable for professional marine activity and serious surface water sports, but not diving
The contribution sits within a longer brand initiative: Blancpain says its first series of Ocean Commitment limited-edition watches was introduced in 2014. Blancpain Ocean Commitment history.
Quick Recap
Best Value
- Stainless Steel case with Black Resin Band
- Black Dial with date window at 3 O'clock
- Luminous markers and hour hands; sweep second hand
- Anti-reverse bezel
- Water-resistant to 200 M (660 feet)
Rank #4
- DIVER-INSPIRED DESIGN — Inspired by the sea, the MDV-106G is styled after classic dive watches and delivers 200-meter water resistance at an unbeatable price point. The black resin band and stainless steel case give it a classic look, while the anti-reverse rotary bezel adds authentic dive-watch character.
- STAINLESS STEEL CASE WITH SCREW-LOCK CROWN & CASEBACK — The MDV-106G features a stainless steel case and a reliable screw-lock crown for enhanced water resistance protection. Screw-down crown and screw-lock caseback work together to keep the movement sealed and secure during water activities — a construction standard found on dive watches far above this price range.
- LARGE FLUORESCENT HANDS & INDICES FOR INSTANT READABILITY — The dial features hands and hour indices with large fluorescent areas for easy reading in low-light and underwater conditions. The clean 3-hand analog layout with date display at 3 o'clock keeps the dial uncluttered and immediately legible at a glance.
- 44MM STAINLESS STEEL CASE | 22MM LUG WIDTH | MINERAL GLASS — The case measures 44mm in diameter, 12mm in height, with a 49mm lug-to-lug length and a standard 22mm lug width — making strap upgrades effortless with a vast range of aftermarket options. Mineral glass protects the dial from everyday scratches and impacts.
- 3-YEAR BATTERY & 200M WATER RESISTANCE — Powered by an SR626SW battery with an approximate 3-year life, the case measures 49.5 × 46.3 × 12.1mm and weighs 92 grams. At 200 meters of water resistance, the Duro is versatile and suitable for all situations — whether in the water, hiking, running, or at the office.
Rank #3
- Round watch featuring corrugated unidirectional bezel, luminous hands/markers, and magnified date window at 3 o'clock
- 40 mm, Length: 210mm, 23k gold-plated stainless steel case with mineral dial window. Movement Caliber: NH35A
- Japanese automatic movement with analog display
- Gold & Stainless steel tone bracelet with foldover clasp with safety closure
- Water resistant to 200 m (660 ft): In general, suitable for professional marine activity and serious surface water sports, but not scuba 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.
