Apologies in advance if this doesn't help. With the IWC Porsche Design Titan
chronograph, the production date can be estimated from the serial number
engraved on the caseback using the "Date Your IWC" website (http://moeb.on-
rev.com/dyIWC/dyIWC.irev). In fact, it only
recognizes my case number. It
stated the movement number was only traceable to movement number 2 265 400,
which would precede anything from 1988.
I think a user would need to "reverse engineer" a result. For example, when I
input a case number (without a movement number) of 2 405 678 (random), it
returned a result stating "the case was most probably produced resp. delivered
around 1988," and showed a range 1988-1990 with a serial number range 2 400
000 to 2 450 000. It also states "External evidence-not confirmed by IWC, but
deducted from datable watches."
Maybe seek out a complete kit (box/papers, etc.) and ask the seller what the
date is on the warranty card? Of course, that only reflects the sale date but
maybe it will get you close.
Good luck finding a 1988 Ocean 2000!
Edit: ooh. Just re-read your post and you are looking specifically at BUNDS.
You'll need more luck! I am finding that very few records are available (more
likely that IWC is not interested in researching and providing records)
especially with regard to the IWC-Porsche Design line. Still, I wish you the
best!