La Mine d'Or on Instagram: "This is the Twinlock winding crown. Patented and introduced by @‌Rolex in 1953, it was a major milestone in our quest for waterproofness. This screw-down crown is not exclusive to Professional models. The brand has now integrated it into all Classic models guaranteed waterproof to 100 metres (330 feet). It is an infallible rampart against dust particles and moisture. By keeping these invisible foes at bay, it protects the heart of the watch and reinforces the wearer's