From RROCA-info
Number produced: 3,827
Original Specification: 6 cylinders, overhead valves, 3 ¼" x 4 ½". (3669 c.c),
single plate clutch, 4 speeds, coil ignition with standby magneto, 4 wheel brakes with servo plus
independent handbrake, suspension semi-elliptic front and rear, wheelbase 129",
chassis weight 2650 lbs., tyres 6.00 x 19, centralised chassis lubrication.
| Chassis Series | Year | Comments |
| GXO 11-111 | 1929/30 | |
| GGP 1-81 | 1930 | |
| GDP 1-81 | 1930 | |
| GWP 1-41 | 1930 | |
| GLR 1-82 | 1930 | 3" longer chassis |
| GSR 1-81 | 1930 | |
| GTR 1-41 | 1930 | |
| GNS 1-81 | 1930/31 | |
| GOS 1-81 | 1931 | |
| GPS 1-41 | 1931 | |
| GFT 1-81 | 1931 | |
| GBT 1-82 | 1931/32 | Thermostatic shutters from GBT22 |
| GKT 1-41 | 1932 | Synchromesh gearbox from GKT 22 |
| GAU 1-81 | 1932 | Electric petrol gauge |
| GMU 1-81 | 1932 | |
| GZU 1-41 | 1932 | |
| GHW 1-81 | 1932 | |
| GRW 1-81 | 1932/33 | |
| GAW 1-41 | 1933 | |
| GEX 1-81 | 1933 | |
| GWX 1-81 | 1933 | |
| GDX 1-41 | 1933 | |
| GSY 1-101 | 1933 | |
| GLZ 1-81 | 1933 | |
| GTZ 1-81 | 1933 | |
| GYZ 1-41 | 1933 | |
| GBA 1-81 | 1933 | |
| GGA 1-81 | 1933 | |
| GHA 1-41 | 1933 | |
| GXB 1-81 | 1933/34 | |
| GUB 1-81 | 1934 | |
| GLB 1-41 | 1934 | |
| GNC 1-81 | 1934 | |
| GRC 1-81 | 1934 | |
| GKC 1-41 | 1934 | |
| GED 1-81 | 1934 | |
| GMD 1-81 | 1934 | |
| GYD 1-69 | 1934 | Controllable dampers from GYD 25 |
| GAE 1-81 | 1934 | |
| GWE 1-83 | 1934 | |
| GFE 1-41 | 1934 | |
| GAF 1-81 | 1934 | |
| GSF 1-81 | 1934/35 | |
| GRF 1-41 | 1935 | |
| GLG 1-81 | 1935 | |
| GPG 1-81 | 1935 | |
| GHG 1-41 | 1935 | |
| GYH 1-81 | 1935 | |
| GOH 1-81 | 1935 | |
| GEH 1-41 | 1935 | |
| GBJ 1-81 | 1935 | |
| GLJ 1-81 | 1935 | |
| GCJ 1-41 | 1935 | |
| GXK 1-81 | 1935/36 | |
| GBK 1-81 | 1936 | |
| GTK 1-63 | 1936/37 |