The Breitling Chronomat B13050 is a classic pilot's watch from the 1990s, characterized by its "two-tone" 18k yellow gold and stainless steel construction. The "Two Watches" or "GMT" designation typically refers to a specialized configuration featuring a UTC (Universal Time Coordinated) module—a small auxiliary quartz clock integrated directly into the bracelet. 

• Case Size: 39mm diameter and approximately 14.5mm thickness.

• Materials: Polished stainless steel case with 18k yellow gold "rider tabs" on the bezel, gold pushers, and a gold screw-down crown.

• Dial: Deep blue (often called "Blue Vitesse") with gold-toned hour markers and sub-dials.

• Movement: Breitling Caliber 13, a highly reliable automatic self-winding movement based on the Valjoux 7750, offering a 42-hour power reserve.

• Functions: Chronograph (60-second, 30-minute, and 12-hour counters), date window at 3 o'clock, and tachymeter scale.

• GMT/UTC Capability: Often equipped with an auxiliary UTC quartz module in the bracelet, allowing for a second time zone display.