That would need a definition, but if I remember well, we had an excellent thread on this topic ( Andrew D initiated it, if I'm correct ).
An Iconic watch is a watch which perfectly represents the brand, os, to me, it is related to the brand.
In this case, I'd say:
AP Royal Oak jumbo, much over the Off Shore.
Blancpain Fifty Fathoms.
JLC Memovox ( Polaris or not ) or Reverso.
UN Freak ( or Sonata )
Rolex Submariner ( or GMT ).
It absolutely unfair to limit to 5...
There are so many brands which had iconic watches, like Panerai with the Luminor, PP with the World Time or the Calatrava, VC with the Chronometre Royal, Breguet with the 3337, GO with the Senator Navigator, Lange with the Anniverary or the Dato, and so on...
Best,
Nicolas
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