It’s well known that Jay Kay, frontman of the British jazz-funk band Jamiroquai, is a lover of cars. One of the many cars he’s owned, a 1968 Mercedes-Benz 600, is now up for auction on Bring a Trailer. The grandfather of today’s S-Class, the 600 was Mercedes’ range-topping luxury car in its day. It acquired a reputation as a favorite of dictators…