Prince Bira was a well known driver of racing cars of the late 1930's.  After the war he resumed his racing career with a Maserati 8CM.  For 1947 he got himself a new Maserati 4CL and with it he won the Grand Prix des Frontières.  In 1947 he also became a works driver racing for Simca-Gordini, winning at Reims and the Manx cup.  In 1948 he continued racing Maserati 4CL and 4CLT/48, winning with both cars.  He continued racing with some success until 1955.

He is seen here rounding the corner onto Victoria Avenue at West Park.  The colour scheme of this car was yellow at the bottom topped with light blue, note: the Siamese flag painted just behind the racing number.