The agreement between Porsche and IWC reached its conclusion in in 1998.
Now, the interesting thing about all this for historical purposes is that none of the Ocean 2000 models were part of the Aquatimer family as such.
Was the case actually manufactured by EPSA (Ervin Piquerez SA, the inventor of the Super Compressor case)?
It seems certain; casebacks for these early references carry EPSA patent numbers, and some, though not all, also have the distinctive diver's helmet EPSA trademark as well.
The 2000 meter water-resistant Ocean 2000 of 1983 was a revolutionary watch, and it was produced in several different versions.
Two regular production civilian models were made, from 1982 to 1998; these were the Porsche Design Ocean 2000, and the Ocean 500.
The last major revision to the Aquatimer family was in 2014, which involved another update to both the aesthetics and the technical features of the Aquatimer.
This version, like the original Aquatimer, had two crowns, with one operating an inner rotating bezel; that design was retained until 2009, when the two-crown design was replaced by a more modern version with a conventional unidirectional rotating bezel.
The Aquatimer was first launched in 1967, in a very different configuration from any modern version (with the exception of the now-discontinued Vintage Collection model).
The very first Aquatimer, reference 812A, was water resistant to 200 meters and had an internal rotating bezel, in a two-crown Super Compressor-style case.
The major launches this year at the SIHH were a revamped Da Vinci collection, not a refresh of the Aquatimer (which would have been timely but perhaps premature given the fact that the entire line was updated only three years ago, with a commitment to a new bezel design that it would probably not have made very much sense to abandon or significantly revise).
However, IWC has announced a new case material, and a new, very complicated watch to go with it: the Aquatimer Perpetual Calendar Digital Date-Month Edition “50 Years Aquatimer." The 50 Years Aquatimer uses IWC's caliber 89802; this is a perpetual calendar with a two digit, digital indication of the month and the date, as well as a digital leap year indication.