Mille wanted all watches, including tourbillons, to be wearable during sport and Nadal is understood to have broken several prototypes, which helped Mille perfect the durable design which became the RM 027.
Mille has continually broken new ground, from using the space-vehicle material Alusic in 2005 to creating dials and movement wheels in precious hardstone from 2008.
He introduced sapphire crystal cases from 2012, with engraved gold miniatures from 2014, as well as cases made from titanium, brightly coloured, layered quartz or carbon TPT — supremely difficult to work yet often gem-set at Mille. Graphene helped make the RM 50-03 McLaren F1 the lightest-ever split seconds tourbillon chronograph in 2017, while the revolutionary design of the RM UP-01 last year, in partnership with Ferrari, makes it, at 1.75mm thick, one of the world’s thinnest watches.