I found this.
Once the [Paris] show was completed, the car was taken back to Pininfarina. At first the car was displayed with a cut off roof line and a backward slanting rear window. The next year the car was given a large wrap-around rear window, making the roof line more fluent. The Rondine remained at Pininfarina's for the next 45 years, rarely being shown and rarely being used. During that time, it covered approximately 3,000 miles and was never painted, never reupholstered and never altered in any way, except for the rear window.Car sold at auction to a private collector in 2008 for $1.6M. Pininfarina used rear design elements for the Fiat 124 coupe. I used to own the Mebetoys diecast, which had the same rear greenhouse as my Matrix.