Dietrich Watch OT-1 Black Diamonds. As a fairly new brand to the world of watches, Dietrich has already kicked things off with a bang. The Dietrich OT watches are without a doubt one of the most unique and fascinating watch collections around. The OT, or Organic Time range, was inspired by the unusual textures and geometric shapes found in nature, giving a certain futuristic and sci fi vibe to the timepieces. The remarkable and complex designs truly showcase the genius of Dietrichs designers.