I certainly trust your word for it as I know nothing about watches (as a pal on another forum likes to say), and even less about Heuers.
It's quite possible I got confused by discussions on another forum, where they were discussing that 13K sale and at the same time 2446Cs.
In any event, it appears 2446Cs are now worth more than 10k, as of today:
http://www.chronocentric.com/forums/heuer/index.cgi?md=read;id=82131Click to expand...