Oyster Perpetual Retail Selling prices The smaller sized OP versions, 28mm, 31mm, and 34mm, operate on Caliber 2232, the self-winding movement with 55 hrs of electric power reserve and patented Syloxi hairspring for enhanced resistance to magnetism. Conversely, the bigger 36mm and 41mm Oyster Perpetual watches count on Caliber 3230, https://ariannai565csh3.wikicarrier.com/user