MODEL: 326939 S/NO: " AN " SERIES ABOVE 2013. A technological masterpiece protected by 14 patents, the Oyster Perpetual Sky-Dweller provides the information global travelers need to keep track of time at a glance. Launched in 2012, the Sky-Dweller is a compelling timepiece of revolutionary design that blends to perfection mechanical sophistication and ease of use. Case size 42mm. Perpetual, mechanical, self-winding, dual time zones, annual calendar.