Brand new Harry Winston Project Z5 Zalium World Time Tourbillon gents watch, Model # 400-MATTZ45ZC-WA. Limited Edition only 50 pieces made. Zalium 45mm round case. Silver dial with grey accent with dual time sub-dials, world city display and open tourbillon displays. Hours, minutes and seconds. Swiss automatic movement. Sapphire crystal front and back. Rubber strap with zalium pin buckle. Water resistant up to 100 meters. Zalium - used exclusively in the aerospace industry and patented by Ronald Winston himself. Tourbillon - compensates for differences in rate caused by a watch adopting different positions. The principle is to mount the balance and escapement in a rotating cage. The balance and escapement rotate around their common axis going through all positions to average out the errors. Tourbillon cages or platforms usually rotate once per minute but 4 minute and six minute tourbillons are also found. The Tourbillon complication is an extremely difficult accomplishment to achieve and generally demands a high premium.

　　subject to availability