1989 Breitling Chronomat Sextant 80350 Chronograph

Date

A feature that displays the current day of the month, typically in a small window on the dial, commonly placed at the 3 o'clock or 6 o'clock position.

Chronograph

A watch with a built-in stopwatch function that allows you to measure elapsed time in addition to its regular time-keeping functionality. It often includes a start/stop button and a reset button.

Tachymeter

A scale on the dial of a chronograph that allows the wearer to calculate speed based on time and distance, typically by measuring how many seconds it takes to travel a fixed distance (e.g., 1000 meters).