Omega Constellation 18K Ref# 168.009 / 168.017 - Excited on this one :)

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The OM-SWISS MADE-OM is general in the 70's, in the 60's many C case and De Ville 18k dials don't the OM on the dial.
 
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Yea its not exclusive, there are gold dials without OM, I'm not certain of when it applied
 
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I love my C case too
The OM-SWISS MADE-OM is general in the 70's, in the 60's many C case and De Ville 18k dials don't the OM on the dial.

Wow!! Thanks for the pics 😀 Cool to see the backside of the Dial.