Thoughts on a ladies 6718

[SFRolex391]

I am considering a 6718 in stainless for my wife. Any thoughts on a good price? I see they can range from $1100 to over 2k based on condition etc.

The one I'm looking at is a 6718 Lady Oyster Perpetual SS automatic watch, circa 1980. Stick hour marks with a ss Rolex Oyster band.

The sellers states that it runs fine but does not know when it was last serviced.

Thanks for any thoughts.