First, your list is hard to dispute and easy to agree with as it is well thought out.
I may also add:
IWC Ocean 2000- first real titanium watch. This may be replaced by the Omega PloProf- true professional diver.
Seiko Astron Quartz- yeah I know, but you didnt say it had to be mechanical and this watch certainly was iconic and the impact was huge.
Hamilton Piping rock -or Ventura
Breitling Navitimer
Universal Aerocompax
Breguet XX
Cartier pasha
Rolex Daytona
Heuer Lemans Mcqueen
Just some thoughts