I have the PO cal 3313 for more than one year, with the Z-33 refund & added some extra $, got myself the new Cal.9300 Planet Ocean in Orange. I also bought an extra orange rubber strap with buckle to go with the watch, much better than the heavy metal band that comes standard. I loved the uncluttered look of the dial, the dual hand chrono register is easy to read, one revolution is one hour. This is the same on my IWC Yacht Club. The old cal 3313 PO will go to a new owner this week, so I managed to take a few quick side-by-side photos showing their visual differences...







