Hi all, I've been offered a rolex submariner with what is described as a genuine seagull perpetual auto sweeping 28,000 bhp high beat movement, the bezel is described as having the latest ceramic 2013,120 clicks movement. 316 L one piece case and crown and 316 L bracelet. Can any of you good folks help a newbee and let me know if this is a good buy, they want £150.