The Buick Sport Wagon was a mid-size station wagon built by Buick and a corporate sister of the Oldsmobile Vista Cruiser. Featuring a raised roof and skylights over the cargo and second seat area, this model was an extended wheelbase version of the Buick Skylark station wagon. Buick Sport Wagons were built in three generations, spanning 1964–67, 1968–69, and 1970–72. During this time period, this was the only luxury level station wagon offered under the Buick model line until 1970 when the Buick Estate Wagon returned in 1970. The last generation did not receive the skylights.
(description text adapted from https://en.wikipedia.org/wiki/Buick_Sport_Wagon)