How rare is a 69 chevelle ss 300 deluxe post car?

this is a one family owned 69 ss with a 396, 3 speed on the floor , bench seat, and the post body with the vent window in the doors.
Update: this is a true 69 SS it has been in the family since new (my dad bought it in jan of 69 at a dealer ship in fredonia, ks),
I still have the protecto-plate and biuld sheet.
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