Oyster Perpetual Retail Prices The smaller OP versions, 28mm, 31mm, and 34mm, operate on Caliber 2232, the self-winding motion with fifty five hrs of electrical power reserve and patented Syloxi hairspring for improved resistance to magnetism. Conversely, the much larger 36mm and 41mm Oyster Perpetual watches rely on Caliber 3230, https://douglasj899vsn6.thekatyblog.com/profile