From RROCA-info
Number produced: 710
Original Specification: 12 cylinders (V-12), overhead valves, 3 ¼" x 4 ½". (7340 c.c), single -plate clutch, 4 speeds, dual-coil ignition, 4 wheel brakes with servo plus independent handbrake, suspension independent front with enclosed coil spring and semi-elliptic rear, wheelbase 142", chassis weight without spare wheel or lamps 4050 lbs., tyres 7.00 x 18, price (chassis) &1850.
| Chassis Series | Year | Comments |
| 3 AZ 20-238 | 1936 | |
| 3 AX 1-203 | 1936 | |
| 3 BU 2-200 | 1936/37 | |
| 3 BT 1-203 | 1937 | |
| 3 CP 2-200 | 1937 | |
| 3 CM 1-203 | 1937/38 | Petrol pump in frame from 3 CM 35 |
| 3 DL 2-200 | 1938/39 | 18 x 5 tyres from 3 DL 78, overdrive from 3 DL 172 |
| 3 DH 1-11 | 1939 |