Omega Constellation 168.017SP

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Hi,
I've recently brought this Constellation. I was wondering if the rotor is the correct one for the year and serial number and not a replacement. I love the watch, only one scratch on the caseback but everything else seems good. Can anyone help to identify if all the parts are 100% authentic. There's an Omega symbol on the crystal. Came with a omega mesh bracelet which i honestly don't mind, it's very comfy to wear.

 
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Since you moved the thread - I’ll repeat my comments here.

Current thinking suggests the ‘O’ on the rotor means it is a replacement part.

However, the 29,4xx serial places the movt at or around the point where the rotor style changed to this more simple version.