This looks more like the common garden variety GM units that were sold in the 1980's and 1990's that you could buy all day for $15.00-25.00. They were sold by GM dealers everywhere for every GM car. They have a suction cup for your windshield. I got one of these for my 74 Chev. Personally i do not think they are worth this kind of coin.
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1957 Pontiac Pathfinder Deluxe sedan restored 261 six
1974 Chevrolet Caprice Estate wagon low mileage original 400 V-8