Designed to compensate for the detrimental effects of gravity on the movement, the Tourbillon is one of the most challenging horological accomplishments. In this Grand Tourbillon GMT II ~ 3-TimeZone watch, the Tourbillon carriage is beautifully highlighted through a generous opening in the lower part of the dial. It is complemented by an impressive array of additional functions: 3-TimeZone’s, Chronometer, Small Seconds, with a Display Back.