Omega Caliber 1655: The Space-Ready Quartz Powering the Early X-33

The Omega Caliber 1655 is a high-precision analog-digital quartz movement, launched in the late 1990s to early 2000s as the original engine behind the first-generation Omega Speedmaster X-33—a watch specifically designed for astronauts, military pilots, and professionals working in extreme environments. This movement was developed in collaboration with aerospace agencies, including input from NASA and professional aviators, to deliver uncompromising functionality and real-time mission tools.

The Cal. 1655 brought Omega's longstanding aviation and space heritage into the digital age, evolving from earlier multifunction quartz calibers like the 1611 and 1620 into something mission-specific, highly legible, and operationally practical.

Technical Specifications

• Type: Quartz, analog-digital multifunction

• Functions:

  • Analog time (hours, minutes, seconds)

  • LCD digital display with:

    • UTC and local time

    • 3 alarms

    • Mission elapsed time (MET)

    • Countdown timer

    • Perpetual calendar

    • Chronograph (stopwatch)

• Backlight: Yes (electroluminescent for night use)

• Battery: Lithium 3V CR2320

• Battery Life: Approx. 2 years

• Accuracy: ±10 seconds/month

• Controls: 4 pushers + crown (multifunction interface)

• Sound Alerts: Loud alarm tone (designed for cockpit audibility)

Omega developed this movement with a dedicated pilot’s interface, emphasizing tactile usability, large digital displays, and independent analog/digital synchronization. The display was large enough to be read at a glance, even in high-pressure or low-light environments.

Watches Powered by Caliber 1655

The Cal. 1655 exclusively powered the first-generation Omega Speedmaster X-33 (ref. 3290.50), which debuted in 1998. This watch was worn by:

• NASA astronauts aboard the Space Shuttle and ISS

• European Space Agency (ESA) missions

• Professional pilots in military and civilian aviation

• Technical divers and ground crew

The X-33’s titanium case, sapphire crystal, and high-contrast digital display made it one of the most advanced professional watches of its time.

Functionality in the Field

The Cal. 1655 was built for real-time mission tracking. Its Mission Elapsed Time (MET) feature allowed astronauts to track the duration of operations to the second, while multiple alarms and dual time zones provided critical situational awareness.

The chronograph and countdown timer functions were also tailored to flight and launch sequences, with tactile buttons operable even with gloves. The backlight could be activated silently, useful during night ops or inside spacecraft.

Servicing and Longevity

The 1655 is a specialized movement, requiring Omega-authorized servicing. While robust, issues like LCD failure, button wear, or backlight malfunction may arise with age. Parts are still supported by Omega, and many X-33s have had their modules replaced during official service intervals.

Collector Interest

The Caliber 1655 is of growing interest due to:

• Its direct link to spaceflight history

• First-gen X-33 collectibility

• Professional-grade features

• Omega’s quartz innovation legacy

Original X-33s with the 1655 movement—especially those with flight or NASA provenance—have become sought-after collector pieces.

Final Thoughts

The Omega Caliber 1655 is a marvel of quartz engineering, designed for those who navigate the sky and beyond. As the foundation of the Speedmaster X-33, it proved that Omega’s space legacy didn’t end with the Moon—it evolved with it. For collectors and professionals alike, the 1655 stands as a true mission-ready movement, built for the 21st century.