Omega Speedmaster Professional X-33 Overview

X-33 Overview

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.

The X-33’s case and bracelet are made of titanium, a strong and lightweight metal. Titanium’s low reactivity means that it is chemically inert in most circumstances, which gives it excellent anticorrsoive and hypoallergenic properties. Despite the longtime popular myths, strictly speaking titanium is neither stronger nor harder than steel. In fact, on a equal weight basis, steel and titanium have comparable strengths. That is to say half-pound rods of steel and titanium would have comparable strengths. However, the 0.5 pound titanium rod would be much thicker than the steel rod since Ti is much lighter and less dense. If we took 0.5 inch titanium and steel rods, the steel rod would be stronger but the titanium would be far lighter — about 65% lighter — which is one of the things that makes titanium so attractive in many applications where weight is a consideration.

Titanium is not harder than steel and titanium watches will scratch, but some of its chemical properties provide other benefits with regard to scratching. In its naturally occurring state titanium is a shiny metal but reacts spontaneously with atmospheric oxygen to form an exterior oxide layer. This titanium dioxide (TiO2) layer is what gives us the familiar matte-gray lustre and is actually even more chemically inert than titanium itself, which adds to the anticorrsoive and hypoallergenic properties. A secondary benefit is that if the surface is scratched, the titanium underneath will react with oxygen in the air to form a new oxide layer. In this regard, light scratches can appear to “heal” over time if the scratch is not deep enough to scratch through the oxide layer to the titanium below.

Although titanium is the fourth most abundant metal in the Earth’s crust, it seldom occurs in isolated form and usually occurs as oxides in mineral ores. It is relatively difficult to isolate into a form that can be used for manufacturing titanium goods. It is also prone to shearing and tearing during machining, which means that special tools and techniques must be used in machining and metalworking. These difficulties mean that finished titanium products are often considerably more expensive than those made of more traditional alloys despite titanium’s natural abundance.

Technical Specifications:

To put some of these details into perspective:

(i) One lux is approximately as bright as the lighting from a candle 1 meter away in a dark room. 8 lux would represent 8-times that intensity, i.e. you would be 1/8th of a meter away (0.125m), which in pitch darkness is VERY bright, easily comparable to the lux-output of a mobile phone considering that most mobile phone LCDs output around 5 lux+.

(ii) dB is the abbreviation for “decibel”. One decibel is one tenth of a Bel, named for Alexander Graham Bell. The measurement quoted in dB describes the ratio (10 log power difference, 20 log voltage difference, etc.) between the quantity of two levels, the level being measured and a reference. To put 80dB SPL into perspective, it is about as loud as a hair dryer or vacuum cleaner or 100 times as loud as a normal conversation (60dB). To understand sound properties and perception, further reading is advised.

(iii) To some the stated water resistance rating might seem somewhat basic but it is more than sufficient for the X-33’s intended space and flight applications, light water exposure, and everyday activities. More on water resistance below.

(iv) Shock ratings are often misinterpreted and over-represented. Do not let the 3,500 g rating mislead you into thinking that the watch can withstand a 3500 times gravity impact or a drop from the upper reaches of the stratosphere. In short, while the X-33 is entirely rugged, its shock resistance rating is actually less than the 5,000 g of the mechanical Speedmaster Professional, as is true for most Quartz/LCD watches. In any case, a 100g watch of either mechanical or digital design dropped from a height of 1m will likely experience shock-related damage on impact if we consider a very hard surface like granite or marble floor.

Basic Functions:

Special Functions designed for NASA Mission Requirements:




TS 186.1998

Speedmaster Professional “X-33“, nicknamed
«Mars Watch», multifunction quartz movement, hybrid display : analog for hours, minutes and second and digital for multifuctions : local time, 1/100 s chronograph with timing capacity of 99h59’59″99/100, enlapsed mission time up to 999 days alarm of mission time, UTC in hour/minute/sec and day number, timer from 99h59’59” to zero, alarm chronograph, perpetual calendar, loud alarm (80dB), powerfull backlight of the display (8 lux), waterproof 50 meters, shock resistant up to 20 G, antimagnetic, -20°C / +70°C operation, precision of ± 0,5 s a day, designed to be used with gloves

Was introduced the 28th of March 1998 to the Houston Space linked with MIR russian station cosmonauts, it is NASA qualified for space shuttle; titanium case with polished steel rotating bezel and pushers, sapphire crystal, back engraved with the seahorse, with black kevelar strap(PIC 3990.50.06) or red Kevlar strap (3990.50.41)



TS 186.1999

ReliftedSpeedmaster X-33 new satin finish rotating bezel with superluminova index at 12‚ and satin finish pushers, new crown with vertical grooves for easier operation, back engraved with the seahorse surrounded by Certified by NASA for Space Missions, new black Kevlar strap (PIC 3991.50.06) or red Kevlar strap (3991.50.41), or titanium bracelet (3291.50)



TS 186.1999

Speedmaster X-33 (see 2001 with caseback engraving Flight-Qualified by NASA for Space Missions and new green Kevlar strap (PIC 3991.50.09)


TS 186.1999

Same as above but special version (12 pieces made only), 10 given to the crew of Team New Zealand (sponsored by Omega), “Defender” of the America’s cup 2003; main characteristics : without hands : made to time races dial with America’s cup New Zealand 2003 (PIC 3992.50.06)



TS 186.1999

Speedmaster X-33, caseback engraved with different US squadrons or NASA, pilots, astronauts or cosmonauts names, titanium bracelet (PIC 3291.52) or Kevlar strap (PIC 3991.52); USA market only

*Data excerpted fromHistory of the Omega Speedmaster as complied and hosted by Chuck Maddox

Water Resistance

A lingering criticism of the Omega X-33 is that it has a water resistance rating of a “mere” 30m. While this is not untrue it is somewhat misguided to criticize an astronaut’s watch for its failings as a dive watch and it is important to keep the intended applications in mind. After all, the original Speedmaster Professional that went to the moon with the Apollo astronauts and survived plenty of ocean slapshdowns had the same “mere” 30m rating, and the Speedmaster is seldom subjected to the same criticisms.

Data previously provided by factory historian Marco Richon of the Omega Museum in Bienne, Switzerland indicates a more robust 50m WR rating. It is not clear if this is a simple mistake or oversight or if Omega may have understated or downgraded the WR when concerns like caseback deformation under pressure emerged. Sources with firsthand knowledge of the model development told us that the watch design before the addition of the hollow caseback had even been successfully tested to a respectable 100m.

While it may be wise to avoid unnecessary water contact with the X-33 and to never use the pushers or pull out the crown under water, the seemingly limited 30m water resistance rating was only predicated on testing showing that the pressure at greater depths risked deforming the thin hollow double caseback required amplify the alarm to the NASA 80dB spec. When it comes to alarm volume and water resistance in a watch, apparently we cannot have our cake and eat it too if we’re using titanium as the case material.

As well, it should be considered that a well-sealed case works two ways in low-pressure environments. A case that does not allow accumulated pressures to dissipate can result in ruptured or ejected crystals in low-pressure environmentd like thodr found at high altitudes and in space, and as such it can be beneficial to have a watch that can make some allowance for “breathing.” And aside from the inability of the watch to continue performing as designed in such a state, foreign object debris (FOD) can present a severe hazard to safe flight if it becomes lodged in flight instrumentation or controls.

In short, while Omega makes other watches that are better suited to swimming and diving, the water resistance of the X-33 is more than suitable for light water exposure, its intended space and flight applications, and for most any everyday task. Owners have also reported swimming and snorkeling without ill effects, but of course individual tolerances for risk may vary and others would consider this unwise. And whatever enthusiast opinions of the “paltry” 30m WR rating may be, the X-33 seems to have been more than sufficient for the Team New Zealand America’s Cup team, who surely got their X-33s more than a little wet. And in any case as one US Coast Guard pilot once related to us, if an aviator has driven his plane into the drink and suddenly finds himself swimming, he has many graver and more pressing concerns than his wristwatch.

The Manual & Packing

Compared to the usual packing one would find an Omega watch inside – the ubiquitous red ‘pleather’ box – the X-33 surpasses in all departments with the ’spacesuit material’ box the X-33 ships in. The watch is also accompanied by a detailed manual, which has been graciously scanned and uploaded to Chuck Maddox’s website for reference. Certainly the packaging has little to do with the quality and functionality of the watch itself, but the distinctiveness of the packaging certainly makes for the pleasant “out of box experience” one would expect when buying a high-quality watch and adds to the uniqueness of the X-33’s presentation.

X-33 Box and accessories.  Photograph courtesy of Kieron

X-33 Box and accessories. Photograph courtesy of Kieron

X-33 Pros & Cons




LCD Display Circular Polarization

Special thanks to Bruce Redding, Gaijin, and the posters of WatchUSeek for the information in this section!

A little known and unpublicized feature of the X-33 recently uncovered is that the LCD display incorporates a special feature intended to prevent interference with polarized optics. Liquid Crystal Displays (LCD) work by polarizing the light of certain sections of the display in particular directions. Most conventional LCD displays have the light coming from them polarized and oriented in a single direction. When viewed through polarized sunglasses, which filter light in a way that only allows light oriented in a particular direction to pass through, an LCD display can “black out” when viewed at orientations in a direction close to perpendicular
to the filter. This is the reason most cellphone and car navigation displays are unviewable at certain angles when wearing polarized sunglasses.

LCD manufacturers typically
attempt to minimize the impact of this effect by orienting the polarization of the LCD display in an advantageous direction, but Omega went a step further. By adding a quarter-wave plate and orienting it in a deliberate manner the polarization of light from the display becomes directionless and won’t be blocked (completely) by polarized filter.

Suunto CORE with conventional polarized LCD display is “blacked out” by orienting a polarizing photographic filter perpendicular to it.

The X-33 on the right remains visible however no matter how the filter is oriented.

See this excellent WatchUSeek thread for more details.

Photos by Gaijin

Though polarized glasses are typically not worn when flying because they can interfere with modern instrumented “glass cockpit” Heads-Up Displays (HUD) and layered glass heated cockpit windscreens, the addition of such a feature that adds to the cost
is notable even if not very necessary. And indeed, NASA may well have some use for the feature unneeded by civilian pilots.

>>> Proceed to Part 2 – Gen 1 and Gen 2 X-33 >>>

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