Hello everyone...
GregB brings up a good point... When you see a watch that is double signed , an Omega with a Tiffany Co signed dial... Are you more attracted to that example or one in the same condition that is not double signed ?
Here is an example from my collection...
Uncommon Seamaster Day Date chronometer caliber 751 co-signed Türler 
and here is the same watch is about the same overall condition without the second signature...
Any thoughts ?
Good Hunting
Bill Sohne