Oyster Perpetual Retail Selling prices The smaller OP variations, 28mm, 31mm, and 34mm, operate on Caliber 2232, the self-winding movement with fifty five several hours of energy reserve and patented Syloxi hairspring for improved resistance to magnetism. Conversely, the larger 36mm and 41mm Oyster Perpetual watches rely upon Caliber 3230, https://epictetusq930egg2.wikiconversation.com/user