Omega Seamaster De Ville - caseback question

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Hello everyone,

I recently bought this beautiful Seamaster. I like the watch and I have two other Seamaster De Ville models in my collection.

What surprises me a little is the caseback. I have never seen this large golden Seamaster symbol on any other watch. I've only seen it smaller in stainless steel. Can anyone here help me or give me some information about it?

  • 34mm without crown
  • reference 166.020
  • monocoque case

Thank you very much!