Klein: My real work on the Portugieser Sidérale Scafusia began three years ago, when we started working on the design. The brief was clear: despite its numerous complications and functions, we wanted to create a classic, wearable, good-looking watch with recognizable Portugieser DNA. At 17.5 millimetres, the height of the watch is relatively modest. It’s water-resistant to 3 bar, has an appealing, uncluttered dial and, despite the giant tourbillon, is the soul of understatement. It only becomes clear that the watch is unique and functions as a personalized precision instrument when you view it from the back.