As a start the VIN is not posted but a poor shot of the windshield information sheets appears to show something like 9F02M22?
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? Documents show it was sold 7/19/1969
Would have been nice if the owner had included a Marti report to help with some of the details asked about.
As for the 70 vents in the rear door post/jamb interesting. We seen similar with the 70 rear side marker lights being installed on late 69 Dearborn cars but for me don't recall seeing the vents on another 69 Dearborn example. Checked and I don't have many pictures from angles that cover that area of very late built cars and of the ones I do not all are original unrestored examples but none I do have pictures of have the details
Pictures of that area of the car being discussed
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Interesting and something else to look for