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A hand, usually on a sub-dial, which completes a rotation in 24 hours and enables the wearer to read the 24-hour time, e.g. 16:00 instead of 4 p.m.
A watch or clock which automatically sounds at a pre-set time.
Watch which automatically recognizes months with 30 and 31 days and needs to be manually corrected only once a year, on the first of March.
The movement is unaffected by exposure to strong magnetic fields, even those greater than 1.5 tesla (15,000 gauss).
A watch function which allows free divers to read instantly how much time has passed. A system of seven circles changes colours completely each minute.
A self-winding watch or automatic watch uses a mechanical movement whose main spring is wound automatically by the natural motion of the wearer's arm.
A bezel which can be turned clockwise or anti-clockwise. Rotating bezels can be used to time events, measure elapsed times, or read second or third time zones.
Ceragold is the result of a process that allows the incrustation of 18K gold into a ceramic bezel. The bezels made of ceramic and the Ceragold are perfectly smooth to the touch.
A casebody created from a single block of pressed ceramic, which is first heated in an oven and then three-dimensionally machined. OMEGA's ceramic watch cases are extremely scratch-resistant and shock-resistant.
The chronograph function is a mechanism for measuring time intervals. A chronograph watch can therefore be used to time events while displaying the time like any traditional watch.
Label given to a watch which has undergone precision tests and received a certificate from an official body (COSC).
The Co-Axial™ escapement reduces friction & the need for lubrication. It maintains accuracy over a longer period of time and prolongs service intervals.
The day of the month, displayed in a window on a watch dial at the 3 or 6 o’clock position, or within a subdial at 9 o'clock.
Apertures which display both the day of the month (numerical) and the day of the week.
The hardest, most luminous precious stone whose value is calculated according to the 4C criteria: Cut - Carat - Clarity - Color.
Visual indicator of the end of life of a battery by successive jumps of the seconds hand of 4 seconds, or a flashing digital display.
A GMT function means that the watch has a second hour hand which completes one full rotation in 24 hours and a 24-hour index on the dial. Particularly useful for wearers who wish to track two time zones.
Decompression system which allows helium to escape from inside the watch when the watch is worn for professional use in pressure chambers. (Long-term underwater work, crude oil exploration, etc.)
Function allowing digital display of the hours in a window at 12 o'clock and the display of minutes by a hand. Each revolution of the minutes hand triggers an immediate jump in the hour window.
A series of watches whose production run is determined in advance of production and limited to a set number.
Liquidmetal is an alloy which is considerably harder than stainless steel yet bonds seamlessly with ceramics. The blended materials are particularly resistant to scratching and corrosion.
A mechanical watch which must be wound by hand via the crown to ensure its continuous operation.
Guaranteeing the Swiss industry’s highest standard of precision, performance and magnetic-resistance, as set by the Swiss Federal Institute of Metrology (METAS).
A moonphase watch uses a function which tracks the phases of the moon. One lunar cycle is 29 days, 12 hours, 44 minutes and 2.8 seconds and includes four phases: new moon, first quarter, full moon, last quarter.
Watch with digital (or combined analogue/digital) display with several functions, such as alarm, chronograph, countdown timer etc. with optional display of the required mode.
A watch series each of whose pieces is numbered sequentially in the order it is produced.
Memory function that respects all date changes, including 29th February in leap years (until 28/02/2100).
Platinum is a precious, heavy and rare element with very high chemical stability and very high resistance to corrosion. OMEGA's platinum watch cases are made of 950 planinum.
A dial or gauge on the watch which indicates how much time remains before the mainspring must be wound or the battery changed.
These highly-prized gemstones are pieces of natural mineral crystal, which have been cut and polished to form lustrous adornments.
A watch with a scale to measure the number of heartbeats per minute.
The quartz crystal is used in an electronic circuit which maintains its oscillation and corrects the rate of the watch. Modern OMEGA quartz movements are decorated with circular graining and rhodium-plated.
A watch function which allows the easy reading of the critical regatta time intervals at glance.
Sapphire crystal is a very hard and transparent materiel that offers extreme scratch-resistance. OMEGA uses sapphire crystal for the front crystal of the watches and for transparent casebacks as well.
Self-locking crown, screwed into the tube of the case, used for highly water resistant divers' watches.
Sedna Gold™ is an 18K rose gold alloy, fusing pure gold with copper and palladium, in order to guarantee that your gold watch has long lasting lustre.
A hand on a sub-dial which tracks seconds typically it completes a full rotation in one minute.
In appearance a split-seconds chronograph is only slightly different from a standard chronograph. Its special feature is the additional device which drives a second center-sweep seconds hand called the split-seconds hand. When the chronograph mechanism is activated the two superimposed hands rotate around the dial. If the split-seconds pusher is pressed the split-seconds hand will stop, allowing the user to read the intermediate time. Meanwhile the chronograph seconds hand continues to turn. If the same pusher is pressed again, the split-seconds hand will catch up with the chronograph hand and continue to rotate in perfect unison with it. This operation can be re-peated as many times as desired.
Stainless steel is an alloy of iron, chromium and other metals making it insensitive to oxidation. OMEGA stainless steel are made from a particularly corrosion-resistant and durable steel alloy.
A tachymeter watch has a function for measuring speed. It is a chronograph with a graduated dial on which speed can be read in kilometres per hour based on a 1000 metre distance.
This precision tool can measure exactly how far you are from something that is visible and audible, such as your distance from a lightening storm.
Allows the hour hand to be easily adjusted to different time zones without stopping the watch.
A highly stable, lighweight and hard metal used for cases and bracelets. OMEGA titanium watches are made of grade 2 and grade 5 titanium. Grade 5 offers a brighter grey color than grade 2 and can be polished more easily.
An ingenious principle which solves the tricky problem of adjusting mechanical watches. All the components of the escapement (escape wheel, pallets wheel, pallets fork and balance spring) are grouped together in a small mobile cage which makes one rotation per minute. This eradicates any differences in rate due to different positions of the watch and thus guarantees optimal precision for a mechanical watch.
A transparent case back - frequently made of sapphire - makes it possible to see the movement inside the watch.
A bezel which turns in only one direction. Particularly useful for divers who cannot accidentally rotate it in the wrong direction, which could cause them to miscalculate their dive times. A rotating bezel makes it easy to measure elapsed time.