Armin Strom Skeleton Pure Water ST15-PW.05

The blue plate shows through a sapphire dial, with blue indexes and logo to match. The movement is the ARM09-S, hand-wound with two barrels and an eight-day power reserve, showing hours, minutes, small seconds and the remaining reserve. It is the same calibre as the more classically styled One Week Skeleton; here 3D PVD colouring gives it a different look. The Water was presented with the Fire at Salon SIAR in Mexico City in October 2014 and won a Red Dot Design Award in 2015. The case is 43.4 mm by 13 mm.

The other Skeleton Pure elements change the case: Air (TI15-PA.RH) is titanium, Earth (ST15-PE.40) black PVD-coated steel and Fire (RG15-PF.5N) 18k rose gold. The Tourbillon Skeleton Water (ST15-TW.05) keeps the plain steel case but runs on the ATC11-S, with a tourbillon in place of the power reserve display.