A few pics of my old PD Ocean 500 next to its big brother, Ocean 2000. I sold the former and kept the latter as I wasn't wearing it as much, but it's a lovely little IWC nugget :-D
A shame there's no successor in the line up, the closest I can think of is the Sinn T50 with its push down bezel. Never understood why IWC never followed up.
There is an interesting history around the relationship and split between IWC and PD at the time which has probably prevented this from ever happening.