Follow these steps to confirm that you have purchased an authentic watch: As long as you buy the watch from an authorized dealer, you will receive a credit card-sized warranty card, filled out with an 8-digit serial number, watch number, purchase date, and the dealer's complete name and address.

A chronograph has hands displaying hours, minutes, and seconds, and is equipped with a mechanical device for measuring elapsed time, which can be shown by the central chronograph second hand, capable of recording time down to the second, and often includes minute and hour accumulation (not mandatory).

A chronometer is a watch whose movement has successfully passed the COSC (Swiss Official Chronometer Testing Institute) precision tests at different angles and temperatures, earning a certification issued by the institute. These tests take at least 15 days.

These buttons are used to start or stop the chronograph function and reset the chronograph hands to zero. Generally, the button at the 2 o'clock position starts and stops the timing function.
In luxury watches, some chronographs feature a single-button design.

"Most mechanical watches that are not certified by the Swiss Official Chronometer Testing Institute have an average error between -1 and +11 seconds per day. The accuracy of a mechanical movement depends on the wearer's habits and may vary. A certified watchmaker can adjust the watch's error to meet the standard."