LEFF Amsterdam Watch Tube D42 LT72021. For the design of the Tube watch we teamed up with Dutch Designer Piet Hein Eek. Piets unparalleled vision on design and LEFF amsterdams raw, industrial and sophisticated approach, came together in an amazing collection of refined yet tough watches. The design of the Tube watch has an iconic extruded ring that functions as the clocks face. Therefore, you can recognize every LEFF amsterdam watch by this unique characteristic.