Oyster Perpetual Retail Rates The scaled-down OP versions, 28mm, 31mm, and 34mm, operate on Caliber 2232, the self-winding movement with 55 hrs of power reserve and patented Syloxi hairspring for improved resistance to magnetism. Conversely, the much larger 36mm and 41mm Oyster Perpetual watches trust in Caliber 3230, introduced in https://chaplina111ume2.ja-blog.com/profile