Richard Mille | RM39-01, A titanium semi-skeletonised dual time zone flyback chronograph wristwatch with date and month, Circa 2020 | RM39-01 鈦金屬半鏤空兩地時間飛返計時腕錶，備日期及月份顯示，約2020年製

Designed exclusively as a flight navigation instrument, the present RM39-01 is an aviation powerhouse which its technicality cannot be underestimated. Its automatic calibre RMAC2 provides a second time zone and a flyback chronograph, two vital complications for pilots. Aside from the complications, the case, baseplate and bridges are all forged with grade 5 titanium, making it extremely resilient to corrosion and very rigid. Richard Mille on the other hand introduces a locking crown system to the watch, a twist on the crown would lock the chronograph pushers, avoiding accidental activation. Last but not least, it features the E6-B slide rule on the bezel, an aviator calculating instrument invented by Lieutenant Philip Dalton in the 1930s. Combining all merits into one, RM39-01 truly captures the modern essence of an aviator's wristwatch.