As to me, the most attractive and compelling new Rolex watch presented by the Swiss brand at Baselworld 2017 was the Rolex Cellini Moonphase. It is not only a new interpretation of an existing layout and a completely new watch, but also consists of a new movement and set of complications which don’t belong to the Rolex portfolio for at least some decades.
Rolex redesigned and re-introduced the Cellini collection of dress watches in 2014. After that, the brand has released an almost unprecedented collection of four different movements for the formal watch family. That embraces a time-only Rolex Cellini, one with a date dial, the Rolex Cellini Dual Time, and for 2017, the 
A moon phase complication, however – especially on a dress watch – is a determined emotional complication without much contemporary practicality. A moon phase indicator is designed to track the roughly 29-day cycle of the moon between its waxing and waning phases. With smart phones and other more useful weather and environmental status-indicating technology, it is a rare case indeed that someone relies upon a mechanical timepiece to be aware of the phases of the moon, let alone have any reason whatsoever to need to know this information actually.
As mentioned above, the moon phase indicator is a nice feature integrated into many fine timepieces, and for this reason, we view it so much in the more niche world of luxury timepieces that market themselves on emotionally driven aesthetics. I must say that I would not have guessed this complication to be of much interest to Rolex, whose aim is to make very top quality replica watches that can be sold in rather high numbers. What I mean to say is that, I think the Rolex Cellini Moonphase is the first decidedly niche Rolex dress watch I’ve ever seen during my lifetime. Moreover, it seems to be a specific intent by Rolex to appeal to attention from other brands which a lot of people assumed Rolex stopped paying attention to any more.
