From RROCA-info

Number produced: 2,212

Original Specification: 6 cylinders, overhead valves, 4 ¼ x 5 ½ (7668 c.c.), single plate clutch, 4 speeds, dual ignition with magneto and coil, 4 wheel brakes with servo plus independent hand brake, suspension semi-elliptic front and cantilever rear, wheelbase 144" or 150", chassis weight without spare wheel or lamps 3996 lbs., tyres 33 x 5 (straight side).

Chassis Series	Year	Comments
MC 1-125	1925
RC 1-125	1925
HC 1-122	1925
LC 1-132	1925/26
SC 1-121	1926
DC 1-121	1926
TC 1-121	1926
YC 1-121	1926
NC 1-121	1926/27	Front hydraulic shock dampers
EF 1-101	1927	Well base wheels, 7.00 x 21 tyres
LF 1-102	1927
RF 1-101	1927	Rear hydraulic shock absorbers
UF 1-101	1927
EH 1-101	1928
FH 1-101	1928
AL 1-101	1928
CL 1-103	1928/29	Aluminium cylinder head
WR 1-132	1928/29	Side by side rear brakes
KR 1-132	1929
OR 1-91	1929