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Registration letters >> RO series
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This page lists registration number codes from the RO series, a series allocated to the Hertfordshire area. Also included, where known, are the date periods that these car registration numbers were used in. The data covers the period of 1900 through to 1972, so registrations seen on later cars wouldn't necessarily be included in this information.
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Interpreting a car's registration number.
The majority of post-war car numbers incorporate a three letter code - where this is the case, letters 2 and 3 signify the location code. So, for instance, a car with the registration number 638 GRO or TRO 512D would be a Hertfordshire-issued number. A car with just two letters, ie RO, would also be from this area. Listed below are the known RO series registrations, with added information (where available) describing when each series was first used, and in a few cases, when it came to an end. Some letter codes were used for more than one period during the 20th Century. This information can be invaluable when trying to date vehicles seen in old photographs, or in old films for instance.
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Also if your car has lost it's original registration, perhaps sold off by a previous owner as a "cherished" number, this information will help you find a suitable replacement, or at least identify which series would be suitable, based on the age of your car and where it was first registered.
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RO Registrations - Hertfordshire.
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| Reg. Letters |
Year Letter |
Start -> End Date (if known) |
| ARO |
K |
OCT 1971 -> |
| ARO |
F |
DEC 1967 -> |
| ARO |
B |
MAR 1964 -> |
| ARO |
|
MAY 1935 -> |
| ARO |
|
JUN 1957 -> |
|
| BRO |
K |
DEC 1971 -> |
| BRO |
F |
FEB 1968 -> |
| BRO |
B |
APR 1964 -> |
| BRO |
|
APR 1936 -> |
| BRO |
|
NOV 1957 -> |
|
| CRO |
K |
FEB 1972 -> |
| CRO |
F |
MAR 1968 -> |
| CRO |
B |
JUN 1964 -> |
| CRO |
|
JAN 1937 -> |
| CRO |
|
APR 1958 -> |
|
| DRO |
K |
APR 1972 -> |
| DRO |
F |
MAY 1968 -> |
| DRO |
B |
AUG 1964 -> |
| DRO |
|
JAN 1938 -> |
| DRO |
|
JUL 1958 -> |
|
| ERO |
K |
MAY 1972 -> |
| ERO |
G |
AUG 1968 -> |
| ERO |
F |
JUL 1968 -> |
| ERO |
B |
OCT 1964 -> |
| ERO |
|
FEB 1939 -> |
| ERO |
|
NOV 1958 -> |
|
| FRO |
K |
JUN 1972 -> |
| FRO |
G |
SEP 1968 -> |
| FRO |
C |
JAN 1965 -> |
| FRO |
B |
DEC 1964 -> |
| FRO |
|
NOV 1941 -> |
| FRO |
|
MAR 1959 -> |
|
| GRO |
L |
AUG 1972 -> |
| GRO |
K |
JUL 1972 -> |
| GRO |
G |
DEC 1968 -> |
| GRO |
C |
FEB 1965 -> |
| GRO |
|
JUN 1945 -> |
| GRO |
|
MAY 1959 -> |
|
| HRO |
L |
SEP 1972 -> |
| HRO |
G |
FEB 1969 -> |
| HRO |
C |
MAR 1965 -> |
| HRO |
|
APR 1947 -> |
| HRO |
|
JUL 1958 -> |
|
| JRO |
L |
OCT 1972 -> |
| JRO |
C |
APR 1965 -> |
| JRO |
C |
APR 1965 -> |
| JRO |
|
FEB 1948 -> |
| JRO |
|
JUL 1960 -> |
|
| KRO |
L |
NOV 1972 -> |
| KRO |
H |
AUG 1969 -> |
| KRO |
G |
JUN 1969 -> |
| KRO |
C |
JUL 1965 -> |
| KRO |
|
APR 1949 -> |
| KRO |
|
SEP 1961 -> |
|
| LRO |
L |
JAN 1973 -> |
| LRO |
H |
AUG 1969 -> |
| LRO |
C |
SEP 1965 -> |
| LRO |
|
JAN 1950 -> |
| LRO |
|
JUN 1962 -> |
|
| MRO |
H |
OCT 1969 -> |
| MRO |
D |
JAN 1966 -> |
| MRO |
C |
NOV 1965 -> |
| MRO |
|
FEB 1951 -> |
| MRO |
|
OCT 1962 -> |
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| NRO |
H |
JAN 1970 -> |
| NRO |
|
FEB 1952 -> |
| NRO |
|
DEC 1962 -> |
|
| ORO |
H |
MAR 1970 -> |
| ORO |
D |
MAR 1966 -> |
| ORO |
|
NOV 1952 -> |
|
| PRO |
H |
MAY 1970 -> |
| PRO |
D |
APR 1966 -> |
| PRO |
|
JUL 1953 -> |
| PRO |
|
FEB 1963 -> |
|
| RO |
|
APR 1925 -> MAR 1928 |
| RO |
|
FEB 1961 -> |
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| RRO |
M |
AUG 1973 -> |
| RRO |
L |
JUL 1973 -> |
| RRO |
J |
AUG 1970 -> |
| RRO |
H |
JUL 1970 -> |
| RRO |
D |
JUN 1966 -> |
| RRO |
|
FEB 1954 -> |
| RRO |
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MAY 1963 -> |
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| SRO |
M |
SEP 1973 -> |
| SRO |
J |
AUG 1970 -> |
| SRO |
E |
JAN 1967 -> |
| SRO |
D |
SEP 1966 -> |
| SRO |
|
JUL 1954 -> |
| SRO |
|
JUN 1963 -> |
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| TRO |
M |
OCT 1973 -> |
| TRO |
J |
NOV 1970 -> |
| TRO |
E |
JAN 1967 -> |
| TRO |
|
DEC 1954 -> |
| TRO |
|
AUG 1963 -> |
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| URO |
M |
DEC 1973 -> |
| URO |
J |
JAN 1971 -> |
| URO |
E |
FEB 1967 -> |
| URO |
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MAY 1955 -> |
| URO |
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NOV 1963 -> |
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| VRO |
J |
APR 1971 -> |
| VRO |
E |
APR 1967 -> |
| VRO |
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OCT 1955 -> |
| VRO |
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JAN 1964 -> |
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| WRO |
J |
MAY 1971 -> |
| WRO |
F |
AUG 1967 -> |
| WRO |
E |
JUN 1967 -> |
| WRO |
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FEB 1956 -> |
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| XRO |
K |
AUG 1971 -> |
| XRO |
J |
JUL 1971 -> |
| XRO |
F |
AUG 1967 -> |
| XRO |
E |
JUL 1967 -> |
| XRO |
|
JUL 1956 -> |
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| YRO |
K |
SEP 1971 -> |
| YRO |
F |
SEP 1967 -> |
| YRO |
|
JAN 1957 -> |
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