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Omega introduced the Speedmaster Professional X-33 in 1998, designed in conjunction with aviators and astronauts alike to meet their exacting demands. An updated and improved version followed in 2001. The original version (ref 3290.50.00) is informally known among enthusiasts as the “1st Generation” or "1st Gen" and the replacement 3291.50.00 as the "2nd Gen"; the internals and operation of both models are essentially identical. The crown design was changed with concentric vertical grooves or grip rings for easier operation since the X-33’s crown is pushed/pulled rather than turned. As well, Omega is believed to have strengthened the crown design to address a specific “collapsing crown” vulnerability that affected early 1st generation units.

The X-33 features the in-house developed and unique to Omega 9-jewel quartz crystal controlled calibre 1666 movement, manufactured by Swatch Group cousin ETA (ETA designation E20.321). The movement was designed especially for the X-33 and has never been used in any other model despite continuing contentions to the contrary. Though various brands like Breitling, Bell & Ross and others have used ETA-made multifunction movements similar to those in the earlier Seamaster Multifunction, the 4-pusher cal.1666 and its unique digital display layout and half-step minute hand remain exclusive to the Omega X-33. The cal. 1666 is a non-thermocompensated movement. In a temperature compensated movement, the frequency of oscillation (pulses per second in this case) stays practically the same at whatever temperature the quartz crystal is subjected to [within limits]. A typical watch crystal tends to operate at 32,768Hz with a frequency period of 30.52uS, however regular watch crystals will deviate from this operational frequency depending on the temperature - this is another reason why atomic clocks, which count the cycles of radiation corresponding to the transition between two energy levels within a caesium-133 atom, are still the most reliable with an uncertainty of less than 0.1nS/day.

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