TudorHydronaut 20010 Automatic Stainless Steel / Blue REF NUMBER: 20010TudorHydronaut 20010 Automatic Stainless Steel / Blue REF NUMBER: 20010ModelHydronautCase Diameter41.0 mmDial Numeral-MovementMechanical AutomaticPower Reserve38 hManufacture Year-Dial Material-Dial Movement CaliberETA 2824-2Case MaterialStainless SteelWater Resistance200.0 m