A long shot but putting it out there. Been looking for an eggshell 3647s with an ed heuer signed movement for a few years now. Let me know if you see one.

 

I came across this one. Perhaps interesting? Its on a Swiss auction site with a minimal description..

 

Thanks Mattp, I think this is the gold-plated 3648s. Pretty nice though!

 

It was a coincidence that I came across this one yesterday. Looks gold indeed. Good luck with your search.