NOMOS Glashütte Tangente 33 Reference No. 122: Solid Caseback Reference No. 123: Sapphire Crystal Caseback The classic, but more delicate-people are different, after all. This model has the finest proportions with a diameter of just 33 millimeters. A truly beautiful watch powered by the manually wound Alpha movement and, like all smaller NOMOS models, with a delicate velour strap.