Nomos Glashutte Watch Tangomat Steel Back 641. Expert design, masterful energy efficiency. Just like bestselling NOMOS model Tangente, Tangomat is also upfront, straightforward, bold, and good-looking. On top of that, it goes its own way. The automatic caliber at its heart, Epsilon, turns everyday energy into hours, minutes, and seconds. Epsilons development in 2005 was a breakthrough moment for NOMOS Glashutte as a caliber producer; and even today, it promises excellent winding and outstanding accuracy.