This is rare. Omega Geneve Chronometer Calibre 602 which is almost never seen, in an 18K solid gold case, in excellent condition. Very cool, very overlooked given how special it is, and potentially obtainable. Very worth having.
https://www.ebay.com/itm/165444232718?hash=item26853ea60e:g:xhIAAOSwhKtiYbkA&LH_Auction=1
This 18K solid gold C-Case Cal 751 is going off today, condition is pretty good so should be a few interested parties.
https://www.ebay.com/itm/185393771307
Fairly confident, but not 100%. The shape of the cardinal indices on the dial point me to WG, as do the details of the hippo on the case back and the overall lustre.
The attached twisto is WG capped, which doesn't prove anything, but adds more to the above.
This Geneve chronometer 602 has just over a day left, $1330 so far, still expecting somewhere between that and $2000, interesting piece in exceptional condition though so could go higher as well.
https://www.ebay.com/itm/165444232718
IIRC, the "WATERPROOF" should be on the medallion if it is a Swiss, solid gold version.
How about US made cases by Ross, Jonell, and the like?
This, 10 mins left, no time to even screenshot: https://www.ebay.com/itm/Vintage-ME...pid=5338899135&customid=&toolid=10001&mkevt=1
This was cheap I think - sold for USD 8800- https://jones-horan.hibid.com/lot/116499450/omega-speedmaster-pre-moon--ref-2998-5?ipp=10