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Dear Art, your Dornblüth certainly is a strong candidate!
Some which I believe could make it as well...
Rolex Sky Dweller. The brand has many cult classics in its Daytona, Sub, Sea Dweller, GMTM, etc.....the Sky D as the first annual calendar cannot be overlooked.

Breguet La Tradition - going by the popularity scale, this seems to be the case of beauty is in the eye of the beholder.

UN Freak. Definitely a candidate in any iteration.

Omega Chronoscope - screams classic esp in bronze gold.

Urwerk 103. No doubt being a cult classic from day 1.