Rapport Watch Winder Quantum Quad Two Leather Grey W622. We've combined the latest technology and premium leather to create our Quantum Duo Watch Winder. The Quantum watch winders represent our exclusive range of leather wrapped watch winders. The Quantum Duo will keep your two watches ticking and in pristine condition when you're not wearing them. We have sourced a quintessential metallic leather which covers the external case, with a velveteen interior lining.