The pursuit of creating ultra-thin watches is decades old, but the effort has heated up in recent years. Audemars Piguet, for example, debuted a perpetual calendar watch — one of the most complex movements around — that came in at just 6.3mm. Around the same time, Piaget blew minds with its 2mm hand-winding watch, the thinnest mechanical watch in the world. Subsequently, Bulgari broke three world records with the Bulgari Octo Finnisimo Tourbillon Automatic, which is simultaneously the world’s thinnest tourbillon and automatic watch (and, as such, the thinnest automatic tourbillon).
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