The Patek Philippe Calibre 89 is a commemorative

Commemorative

Commemorative may refer to:*Commemorative coin*United States Commemorative Coin*Commemorative issue - a special edition of a book, magazine, or other item released around, or in memory of, a special event or occurrence.*Commemorative stamp...

 pocket watch

Pocket watch

A pocket watch is a watch that is made to be carried in a pocket, as opposed to a wristwatch, which is strapped to the wrist. They were the most common type of watch from their development in the 16th century until wristwatches became popular after World War I during which a transitional design,...

 created in 1989, to celebrate the company's 150th anniversary

Anniversary

An anniversary is a day that commemorates or celebrates a past event that occurred on the same day of the year as the initial event. For example, the first event is the initial occurrence or, if planned, the inaugural of the event. One year later would be the first anniversary of that event...

. Declared by Patek Philippe as "the most complicated watch in the world", it weighs 1.1 kg, exhibits 24 hands and has 1,728 components in total, including a thermometer

Thermometer

Developed during the 16th and 17th centuries, a thermometer is a device that measures temperature or temperature gradient using a variety of different principles. A thermometer has two important elements: the temperature sensor Developed during the 16th and 17th centuries, a thermometer (from the...

 and a star chart

Star chart

A star chart is a map of the night sky. Astronomers divide these into grids to use them more easily. They are used to identify and locate astronomical objects such as stars, constellations and galaxies. They have been used for human navigation since time immemorial...

. Made from 18 carat (75%) gold, it has an estimated value of $6 million, and took 5 years of research

Research

Research can be defined as the scientific search for knowledge, or as any systematic investigation, to establish novel facts, solve new or existing problems, prove new ideas, or develop new theories, usually using a scientific method...

 and development, and 4 years to manufacture. Four watches were made; one in white gold, one in yellow gold, one in rose gold and one in platinum.

Complications (Features)

• Day of the month
• 12-hour recorder
• Day of the week
• Hour of second time-zone
• Moon phase display
• Winding crown position indicator
• Century decade and year displays
• Leap Year
  Leap year
  A leap year is a year containing one extra day in order to keep the calendar year synchronized with the astronomical or seasonal year...
  
   Indicator
• Power reserve
  Power reserve
  Power Reserve Indicator is a complication of the watch, which is designed to show the amount of remaining stored energy. The power reserve indicator indicates the tension on the mainspring at any particular moment.-Overview:...
  
  
• Month
  Month
  A month is a unit of time, used with calendars, which was first used and invented in Mesopotamia, as a natural period related to the motion of the Moon; month and Moon are cognates. The traditional concept arose with the cycle of moon phases; such months are synodic months and last approximately...
  
  
• Thermometer
  Thermometer
  Developed during the 16th and 17th centuries, a thermometer is a device that measures temperature or temperature gradient using a variety of different principles. A thermometer has two important elements: the temperature sensor Developed during the 16th and 17th centuries, a thermometer (from the...
  
  
• Date of Easter
  Easter
  Easter is the central feast in the Christian liturgical year. According to the Canonical gospels, Jesus rose from the dead on the third day after his crucifixion. His resurrection is celebrated on Easter Day or Easter Sunday...
  
  
• Time of sunrise
  Sunrise
  Sunrise is the instant at which the upper edge of the Sun appears above the horizon in the east. Sunrise should not be confused with dawn, which is the point at which the sky begins to lighten, some time before the sun itself appears, ending twilight...
  
  
• Equation of time
  Equation of time
  The equation of time is the difference between apparent solar time and mean solar time. At any given instant, this difference will be the same for every observer...
  
  
• Star chart
  Star chart
  A star chart is a map of the night sky. Astronomers divide these into grids to use them more easily. They are used to identify and locate astronomical objects such as stars, constellations and galaxies. They have been used for human navigation since time immemorial...
  
  
• Sun hand
• Time of sunset
  Sunset
  Sunset or sundown is the daily disappearance of the Sun below the horizon in the west as a result of Earth's rotation.The time of sunset is defined in astronomy as the moment the trailing edge of the Sun's disk disappears below the horizon in the west...
  
  
• Split second hand
  Double chronograph
  Double chronograph is a watch that includes two separate stopwatch mechanisms in order to estimate two separate events of different durations. It is often confused with the flyback chronograph.-Functioning:...
  
  

Specifications

• Total diameter 89 mm
• Total thickness 41 mm
• Total weight 1100 grams