The 346 was the first of the Sapphires introduced late in 1952 for sale in 1953 and continuing until 1958. The six-cylinder 3,435 cc engine had hemi-spherical combustion chambers and could have optional twin Stromberg carburettors(£25 extra) which increased the output from 125 to 150 bhp (93 to 112 kW) giving a top speed in excess of . The front suspension was independent coil springs with a rigid axle and leaf springs at the rear. The Girling hydraulic brakes used drums all round.