Louise Piëch got a fleet of personalized Porsches throughout the years as birthday presents, and her final one happened to be a 1989 Carrera 4, in silver, with a unique interior and the familiar plates featuring "S 200."Perhaps the most interesting detail is the mottled mother-of-pearl fabric replacing the factory leather. It was reminiscent of the curtain employed in Porsche offices in the 1970s. The rest of the trim is wrapped in white-leather, with fluffy white edges. "Who the hell did that?"is a question often asked by dentist and current owner Clemens Frigge.

...Yet the origins of this silver 964 Carrera 4 remain a secret to whoever makes an enquiry.

Today, it shares a hangar formerly used by the Canadian Army's tank fleet. With 64,000 miles on the clock, its original paint and all matching numbers, it's parked next to a Mercedes-Benz of a famous German private banker from the 1950s, a rare VW Beetle, and one of the Messerschmitt cabin scooters that are still roadworthy. Louise Piëch died in 1999, at the age of 94.