While at first glance the Tetra may seem like ‘simply’ a square version of the Tangente, there are actually a few other changes that give this watch its own personality. Did you ever notice the change in the numerals, or the Art Deco’esque stepped lugs?Reference 401 has a case of 27.5*27.5mm and a stainless steel back. It is powered by the hand-wound Alpha caliber.
