There is one for sale on chrono 24 for quite sometime.

 

A few of them in this thread actually.
http://omegaforums.net/threads/another-rare-18k-tri-compax-ref-181102.5716/#post-70728

 

Casowatches seems to have quite a few UG watches (including TriCompax)

 

Caso seems to get some very nice examples from various manufactures. IMO they're priced at the higher end of dealer, and I haven't found much willingness to negotiate, and least through their website. Cash in hand in the store might be better, and it'd be on my list of visits when next in the area.

 

Agree with you on that!!

 

I've had a buying experience with Caso,
Inventory often shows a nice selection keeping in mind any buying project needs homework
They're responsive, provide professional high resolution photos allowing to properly assess the watch
Asking prices are mostly high (or should I say to the roof ?), there's room for negotiation though if you target well your offer
Will gladly deal with them again but only for scarce watches in top condition, not sure we can make a good deal for others watches