Quote Originally Posted by sandman View Post
One thing on my watch that I had never seen before is on the case back. It says “professional moonwatch”. Does anyone know when omega started putting this on the watch? It seems a strange addition to me.

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This may help with the Speedmaster history? From Chuck Maddox, RIP http://chronomaddox.com/moonwatch_casebacks.html

All the best

Martyn.