SH 2024 Carbon Fiber Automatic Chronograph Watch — SW500/ETA7750, 45mm, 300m

SH 2024 Carbon Fiber Automatic Chronograph Watch — SW500/ETA7750, 45mm, 300m

The SH 2024 is a 45mm automatic chronograph watch built with a carbon fiber case, powered by the Sellita SW500 movement (sold as ETA7750 — the SW500 is a Swiss-made direct equivalent of the Valjoux ETA7750). It is rated to 300m with a helium escape valve, screw-down crown and see-through exhibition caseback. Case material is full carbon fiber rather than carbon fiber pattern or carbon fiber coating. FKM rubber strap. Available in blue and grey dial configurations.

The SW500/ETA7750 is a Swiss-made automatic chronograph movement providing day, date, 30-minute counter and 12-hour counter alongside the main time display — the SH 2024 is a full chronograph, not a time-only automatic.

Key Specifications

Variants — Blue and Grey Dial

Blue dial: A deep navy-to-midnight blue field with the chronograph sub-dials creating contrast zones across the dial. The blue dial is the more conventional dive-sport colour pairing with the carbon fiber case — the dark carbon and navy blue are tonally complementary, with the lighter sub-dial registers providing the contrast structure. The blue dial on a carbon fiber case with FKM rubber strap is the most sport-focused configuration.

Grey dial: A cooler, lighter mid-grey dial that creates a different relationship with the carbon fiber case than the blue — less contrast between dial and case material, creating a more uniform, technical character. The grey reads as more contemporary and instrument-focused than the blue.

Carbon Fiber Case — What It Provides

Carbon fiber is the material of choice in motorsport and aerospace applications for its specific combination of properties: high stiffness, very low weight, and resistance to corrosion and most chemicals. In a watch case, carbon fiber provides:

Weight reduction: at 148g the SH 2024 is notably lighter than an equivalent 45mm stainless steel watch, which would typically weigh 180–220g. For a large-format sport chronograph worn for extended daily use, this weight difference is meaningful.

Durability: carbon fiber is harder than stainless steel in terms of scratch resistance on flat surfaces, though it can chip or crack at corners and edges under sharp impact — a different failure mode than steel, which dents rather than chips. For daily wear the surface resistance is an advantage; for extreme physical use, be aware of the impact sensitivity difference.

Appearance: the woven carbon fiber pattern — visible on the SH 2024 case surfaces — has a distinctive three-dimensional visual texture that varies depending on the viewing angle and the specific weave pattern used. The dark grey-black carbon fiber case creates a stealth, all-dark foundation for the coloured dial and movement.

Temperature neutrality: carbon fiber does not conduct heat as readily as metal, so the case remains closer to ambient temperature on the wrist rather than feeling cold on initial contact the way a metal case does.

Movement — SW500 / ETA7750 Automatic Chronograph

The SW500 is manufactured by Sellita in Switzerland and is a direct structural equivalent of the Valjoux ETA7750 — the same dimensions, the same function layout, the same 25 jewels and 28,800 vph. The WatchUSeek community consensus on SW500 vs ETA7750 is that they are functionally equivalent: “ETA 7750 vs SW500 is apple vs. apple. Buy the watch you like best.”

What the SW500/ETA7750 provides on the SH 2024:

The 6-9-12 subdial layout is the classic chronograph configuration: small running seconds at 9 o’clock, 30-minute elapsed time counter at 12 o’clock, 12-hour elapsed time counter at 6 o’clock. Day display at 12 o’clock and date at 3 o’clock complete the complication set. This is a full three-register chronograph with day-date — not a simple time-only automatic.

Operation:

• Top pusher (2 o’clock): start/stop chronograph
• Bottom pusher (4 o’clock): reset chronograph to zero
• Crown position 1 (first click): advance date
• Crown position 2 (full pull): set time

Power reserve: approximately 48 hours — slightly longer than the ETA7750’s standard quoted 48 hours due to the double-barrel variants available. The movement is fully automatic, self-winding through wrist motion, and can be hand-wound via the crown.

The exhibition caseback presents the SW500 movement and rotor. At 28,800 vph the seconds sweep is smooth and visible through the back.

300m Water Resistance and Helium Valve

300m is a professional dive watch specification — significantly beyond the 200m standard of most dive watches. This depth rating requires enhanced crown sealing (screw-down), reinforced caseback sealing and structural case integrity sufficient to withstand 30 ATM of ambient pressure.

The helium escape valve is included for professional saturation diving applications. During a saturation dive, divers live in a pressurised habitat for days or weeks. When decompressing, the gradual reduction in ambient pressure allows helium atoms (which penetrate watch seals due to their small atomic size) to escape safely through the one-way valve rather than building up internal pressure that could blow the crystal out. For recreational diving and daily wear, the helium valve is not functionally necessary — but its presence confirms the engineering standard of the case construction.

FKM (fluoroelastomer rubber) strap is the correct material choice for a 300m dive specification watch — FKM is chemically resistant to salt water, pool chemicals, sunscreen and other compounds that degrade standard rubber or leather straps. The 25mm lug width is unusually wide, consistent with the 45mm case diameter.

Who Is the SH 2024 For?

The SH 2024 is built for:

• Buyers who want a full automatic chronograph (SW500/ETA7750) in a carbon fiber case at this price — the combination is unusual
• Large-watch buyers: at 45mm with a 16.5mm case height this is a substantial, bold wrist presence suited to wrists 7.5 inches and above
• Professional and recreational divers who want chronograph functionality alongside 300m water resistance
• Carbon fiber case buyers who want the weight reduction and material character over standard stainless steel

Important size note: 45mm with a 16.5mm case height and 25mm lug width is a large watch. It will wear significantly oversized on wrists below 7 inches. If you are unsure about fit, consider this carefully before purchase.

How It Compares

vs. Oblvlo Carbon Fiber — The Oblvlo carbon fiber takes a different architectural approach with a skeleton design. The SH 2024 is the 300m dive-rated chronograph alternative for buyers who want water resistance alongside the carbon fiber aesthetic.

vs. Tsar Bomba TB8208 — The Tsar Bomba TB8208 is another carbon fiber automatic. Compare case size, movement specification and water resistance rating directly.

vs. Bonest Gatti Carbon Fiber — The Bonest Gatti takes a different design direction with the same material. The SH 2024 is the dive-chronograph carbon fiber option; compare for design preference.

vs. Farasute Trackmaster II — The Farasute Trackmaster II is a mechanical automatic chronograph in a stainless steel case. The SH 2024 offers the carbon fiber weight reduction and 300m water resistance; the Trackmaster II has a more conventional sport chronograph character.

More from Jewelry Addicts

Exploring carbon fiber watches and automatic chronographs:

• Oblvlo Carbon Fiber Watch — carbon fiber skeleton alternative
• Tsar Bomba Carbon Fiber Watch — another carbon fiber automatic
• Farasute Trackmaster II Chronograph — automatic mechanical chronograph alternative
• Best Automatic Watches Under $200 — full roundup including chronographs and sport automatics