Also Existing on the dial and hands is Rolex’s Chromalight lume. This more recent in-household materials was initial introduced in 2008 as Rolex’s proprietary luminescent compound and considering the fact that its introduction, it's fully replaced Super-LumiNova throughout the brand name’s lineup. Christie’s This was mostly a ref. 6538 — https://www.watchesworld.com/frozen-in-time-luxury-watches-for-winter/