The alligator leather and calfskin straps made exclusively for IWC by Italian shoe manufacturer Santoni are among the finest work of their artisan craftsmen. One of the secrets of Santoni’s success is the nuanced shading of the leather. Elaborately finished by hand, every strap comes with an exclusive patina-like shimmer with its own individual colour tones. The technique makes leather look as if it had already been lovingly cared for over a period of several years despite the fact that it is brand new. To achieve this effect, the surface of the leather is polished with a variety of different pastes until it has the desired shading and a perfect sheen. Another hallmark Santoni feature is the orange lining on the inner surface of the strap.