Please help identifying Omega Speedmaster gold case

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Hello to all,
I´m interested in buying the following Speedmaster.
The only picture (very poor) I have is:
attachment.php
I know it´s small, poor, etc. and difficult to assess based on that.
I´ve never seen such a dial and may have the opportunity to look at it next week. I´m more into Omega dive watches.
What am I supposed to check? Did this dial really exist? Is it automatic or manual winding? What kind of caliber? Does the caseback have engravings (e.g. The first watch on the moon) or only the Seamonster? Is the caseback supposed to be a snap-on? Where is the serial number supposed to be (lug at 7)?
Any help is highly appreciated.

Best regards.
 
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It was for auction but, unfortunately, I couldn´t take part.

Regards.