After getting my PAM00118F, I realised that I do have a couple of titanium cased watches. Not too sure if the titanium used in all the watches are of the same grade, but they are nice and very light. I have seven, and all but one is pre-loved.
Breitling Aerospace. One of my favourite.
Tutima NATO Military Chrono TL.
Ennebi Fondale. Grade 5 titanium.
Another Ennebi Fondale. Also Grade 5 titanium.
Omega X-33 Gen 1. Another favourite.
Tudor Pelagos. This, I got new.
I like titanium. Light, robust (but prone to scratches) and hypoallergenic.