For the design of the Tube Watch we teamed up with Dutch Designer Piet Hein Eek. Piet’s unparalleled vision on design and LEFF amsterdam’s 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 ring that functions as the clock’s face. Therefore, you can recognize every LEFF amsterdam watch by this unique characteristic. Case Material: Solid 316L Stainless Steel Band Material: Leather or Cordura/Leather (Depending on Color) Case Lens: Mineral Glass Number Display Type: Analogue Movement: Japanese Miyota 2035 - 3 Hand Crown: Push/Pull with Diamond Cut Teeth Water Resistance: 5ATM / 50 Meters / 165 Feet Battery Type: SR626SW (Included) Watch Face Diameter (mm): 38mm or 42mm (Depending on Size) Band Length (mm): 120/80 Band Width (mm): 20 or 22 (Depending on Size) Case Thickness (mm): 9.1 or 10.6 (Depending on Size) Watch Weight (g): 50 or 70 (Depending on Size) HTS: 9105.21/9113.90