25643BA Audemars Piguet ‘Sun Ray’ Tourbillon


If the tourbillon is often utilized a bit garishly (and let’s be honest, it is), it certainly didn’t start that way. Despite almost no one knowing the reference and it rarely receiving a mention at all, this ‘Sun Ray’ ref. 25643 was the world’s first self-wound tourbillon wristwatch and the first to be serially produced.…

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