Oyster Perpetual Retail Selling prices The smaller OP versions, 28mm, 31mm, and 34mm, operate on Caliber 2232, the self-winding movement with 55 hours of electrical power reserve and patented Syloxi hairspring for enhanced resistance to magnetism. Conversely, the larger sized 36mm and 41mm Oyster Perpetual watches count on Caliber 3230, https://edmundb912xqg7.newsbloger.com/profile