Oris Automatic Calendar Wristwatch with Moonphase

• Date Aperture - A date aperture is a cut out section in the face of a watch or clock, displaying the day of the month.
• Movement - The technical name for the workings of a clock or watch, and does not include the dial or case.
• Guilloche - A form of classical decoration consisting of a repeating ornament of interlacing curved bands, sometimes forming circles, and further decorated with rosettes or other flower forms.
  
  The name is derived from the inventor, French engineer Guillot, who invented a mechanical method of inscribing fine repeating patterns on to metallic surfaces.
  
  On enamelled items with guilloche decoration, the surface is firstly engraved with the repeating pattern, and then covered with several layers of enamel, each of which is fired.
  
  Where the item has not been enamelled the form of decoration is usually called "engine turned".

This item has been included into following indexes:

• Oris - wristwatches 27