Rolex pre owned oyster perpetual date explorer ii this stunning pre owned rolex watch uses a 903l grade stainless steel to house its 3185 calibre part of the y series the rolex watch is water resistant up to 330 feet with a scratch resistant sapphire crystal glass front the explorer ii was developed for cave exploring and similar expeditions featuring a red gmt hand and the 24 hour markings on the bezel the oyster perpetual model was used for determining day and night in dark environments