The Jaeger-LeCoultre Master Compressor Geographic (Q1718170) is a men's watch with a stainless steel case and band, a black dial, and a sapphire crystal. It has a dual time zone, date, and AM/PM indicator. One of the first things you will notice when putting on the JLC Master Compressor ref. Q1718170 are the two large crowns. Jaeger-LeCoultre uses a ‘compressor’ system to make these watches water resistant.