Bell & Ross by Sinn 144.GMT.ST Chronograph 41mm (1990s)

The Bell & Ross by Sinn 144.GMT.ST is a distinctive chronograph from the early collaboration between Bell & Ross and renowned German tool-watch maker Sinn during the 1990s. This particular model is part of a respected series that blends Swiss design philosophy with German engineering precision, resulting in a rugged, aviation-inspired timepiece with professional functionality.

The watch features a 41mm stainless steel case with a brushed finish, giving it a purposeful, instrument-style aesthetic. The black dial is highly legible, marked with bold Arabic numerals and luminous hands and indices, ensuring clarity even in low-light conditions. Its chronograph layout includes three sub-dials for tracking elapsed time, and it also features a GMT hand for dual time zone functionality — an essential tool for pilots and global travelers. A day-date display is positioned at 3 o’clock, and the dial is protected by a sapphire crystal.

Inside the case beats a Swiss automatic movement, likely based on the Valjoux 7750 GMT variant, known for its durability and reliability. The watch typically comes on a titanium bracelet, and is water-resistant, making it suitable for daily wear and light adventure. The 144.GMT.ST is now a sought-after piece by collectors for its historical significance, rugged functionality, and the unique collaborative legacy between Bell & Ross and Sinn—two brands with deep roots in aviation and military timekeeping.

Specifications:

• Brand: Bell & Ross by Sinn
• Model: 144.GMT.ST
• Production Era: 1990s
• Dial: Black with Arabic numerals
• Hands/Markers: Luminous hands and markers
• Crystal: Sapphire crystal
• Bezel: Rotating 60-minute bezel
• Case Diameter: 41mm
• Case Material: Titanium
• Strap: Stainless steel bracelet or leather strap (varies by model)
• Movement: Automatic chronograph with GMT function (likely Valjoux 7750 GMT)
• Functions: Hours, minutes, small seconds, chronograph, GMT (24-hour hand), day-date
• Water Resistance: Not Recommended