Anti-Magnetic: The movement is unaffected by exposure to strong magnetic fields, even those greater than 1.5 tesla (15,000 gauss).Chronometer: Label given to a watch which has undergone precision tests and received a certificate from an official body (COSC).Date: 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.Master Chronometer Certified: Guaranteeing the Swiss industry’s highest standard of precision, performance and magnetic-resistance, as set by the Swiss Federal Institute of Metrology (METAS).Transparent Caseback: A transparent caseback - frequently made of sapphire - makes it possible to see the movement inside the watch.Diamonds: The hardest, most luminous precious stone whose value is calculated according to the 4C criteria: Cut - Carat - Clarity - Color.Numbered Edition: A watch series each of whose pieces is numbered sequentially in the order it is produced.Moonphase: 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.Pulsometer: Pulsometer A watch with a scale to measure the number of heartbeats per minute.Telemeter: 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.