Summary of Rolex Clasps: 1. Oysterclasp: on Oyster Perpetual, Datejust, and Sky-Dweller 2. Crownclasp: on Day-Date Presidential bracelet, and some Jubilee bracelets 3. Oysterlock Clasp: on Professional line watches (Submariner, GMT Master II, Yachtmaster, etc) Features: Easy link Extension: on some modern Oysterlock Clasps Glidelock extension system: on modern Submariner, and Submariner Date, SeaDweller, and Deep Sea Fliplock extension link: on modern SeaDweller and Deep Sea, and pre-modern Submariner and Submariner Date Please see Playlist for more Rolex: • Rolex Reviews in Real Life