I can't see anything wrong with it.
The 795 reference number is OK (ladies bracelet watch/electronic/water resistant).
Not every model is shown in the OVDB and not being able to see the full reference clearly I can only go by the first three numbers.
Caseback markings aren't unusual for that period, case made by Louis Lang SA in Porrentruy, Switzerland.
Movement serial dates to about 1985.
The De Ville emblem on the caseback was introduced in 1981 and at that time there were some unusual models being produced by Omega (also some crap ones).
So, it has nothing to do with Constellations, it is genuine and it is rare.
Note: Rarity has no relationship to desirability or high value.
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