Breitling Navitimer Twin Sixty 2, featuring Navitimer's signature slide rule bezel. The slide rule was used by pilots to perform simple arithmetic, conversions, and other calculations in an era before GPS and calculators. This unique watch was specially produced in 1999 and subsequently discontinued. Our watch measures 42mm in diameter. Sapphire crystal. Caliber B39. Ref. A39022 I've been in the retail industry since 2003. I love wearing and selling watches. I offer the highest quality and cleanest watches. After verifying their authenticity, I perform all necessary maintenance. Everyone's happiness makes me happy.