I just found a grail of mine on eBay. Cost me a pretty penny, but titanium-cased screw-back Gs don't grow on trees. Here's the seller's pic. I can't wait to dive with this watch. I think it'll look good with my drysuit.
I thought I should give the forum a heads up in case anyone else has been looking for one of these. The seller had a couple more available when I bought mine. Not affiliated with blah blah blah.