The first time, it ws just before Opus 6, in 2005 or 2004.
BUT.
The price.
Anyway, my theory fortunately worked, and by 2012, 6 years later...prices of tourbillons went up by 300% at the top end. Down by 200% at the weirdly world of carousel made in china end.
BUT...as in antiquities and art and all things of craft...there is good, better, best and ultimate...Hammer of Thor.
I will not be surprised if the next GF will have a case made from the Hammer itself!