James (who raised this whole debate), has confirmed taht the 1163 P Diver insert, it is definitely a different size (interior radius is 1mm larger) to the 11630 bezel, to fit a domed acrylic glass.

Stewart

: Interesting discussion. The next page in the 1972 catalogue we are
: referring to lists a 11630 GMT but illustrates a 1163 GMT and we
: all know that the 1163 GMT exists. The real puzzel for me is the
: decompression bezel on Darren's watch. It has a solid orange
: triangle. The later examples (11630 & 11063) had a lume dot
: in the triangle. The solid triangle is the one illustrated in
: the catalogue. I was under the impression although never put it
: to the test that a 1163 bezel has a different dimension to the
: 11630 and certainly the 11063. So it stands to reason that if we
: accept the bezel as being original and my gut feeling says it
: is, then it is conceivable that a 1163P did exist. I would like
: to think so as it is such a handsome watch but sadly I do not
: have one to prove the point. Darrens watch is just a dial away
: from the proof we need and that dial exists in the 11630P.
: regards
: Paul
: www.heuerworld.com