Oyster Perpetual Retail Charges The lesser OP versions, 28mm, 31mm, and 34mm, run on Caliber 2232, the self-winding motion with fifty five hrs of electricity reserve and patented Syloxi hairspring for enhanced resistance to magnetism. Conversely, the bigger 36mm and 41mm Oyster Perpetual watches rely on Caliber 3230, released in https://richardp404ewn1.wikiexpression.com/user