Help identifying this Omega Constellation Automatic 153.758 - considering purchase

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Long time lurker, first time poster. Appreciate all the wisdom amongst the members, hopefully I can call upon your insights of this “like new” 1970s Constellation. The reference number in the C24 listing (153.858) doesn’t match the case, which I assume was a typo, but I’m finding very little in my own research.

As this is being sold by a private seller in Italy and I’m in the US, I’m wondering whether it’s authentic in this condition? What questions I should (or shouldn’t) be asking the seller?

Thanks in advance