1969 - on
Note:
The engine number is located on the left side of the engine immediately
below the cylinder barrel.
The frame number is stamped on the left side of the frame, on the front engine mounting lug.
The first letter indicates the month of manufacture as follows:-
A - January
B - February
C - March
D - April
E - May
G - June
H - July
J - August
K - September
N - October
P - November
X - December
The second letter indicates the season year of manufacture as follows :-
C - 1969
D - 1970
E - 1971
G - 1972
H - 1973
J - 1974
K - 1975
N - 1976
P - 1977
X - 1978
A - 1979
B - 1980
The third section is a numerical block of five figures which commence with engine number 00100.
The fourth section indicates the model.
Example: NC00100T120R - N=Month C=Year, Number, T120R=Model.
1963 to 1968 Unit 650cc
1963 - DU101 to DU5824
1964 - DU5825 to DU13374
1965 - DU13375 to DU24874
1966 - DU24875 to DU44393
1967 - DU44394 to DU66245
1968 - DU66246 to DU90282
1957 to 1968 Unit 350 & 500cc
1957 - H101 to H760
1958 - H761 to H5484
1959 - H5485 to H11511
1960 - H11512 to H18611
1961 - H18612 to H25251
1962 - H25252 to H29732
1963 - H29733 to H32464
1964 - H32465 to H35986
1965 - H35987 to H40527
1966 - H40528 to H49832
1967 - H49833 to H57082
1968 - H57083 to H67331
Frame number prefix :
Rigid - 3T = TC
Rigid - 5T, T100, 6T, TR5 = TF
Swing Arm - all pre-unit = S
Swing Arm - '21' = H
1950 to 1962 Pre-Unit 500 & 650cc
Engine
numbers had a prefix indicating the model type along the lines above
such as 3T, 5T, 6T, T100, T110, 3TA, 5TA etc. This was followed by a
number from the list below.
YEAR - Pre-Unit 500 & 650cc
1950 - From 100N
1951 - 101NA to 15808NA
1952 - 15809NA to 25000NA then 25000 to 32302
1953 - 32303 to 44134
1954 - 44135 to 56699
1955 - 56700 to 70929
1956 - 70930 to 82799 then 0100 to 0944
1957 - 0945 to 011115
1958 - 011116 to 020075
1959 - 020076 to 029363
1960 - 029364 to 030424 then D101 to D7726
1961 - D7727 to D15788
1962 - D15789 on
1937 to 1949
The year and model were used as a prefix to the engine number
From 1937 to 1939 the final digit ( 7, 8 or 9 ) was used.
From 1946 to 1949 the final two figures ( 46, 47, 48 or 49.)
The model numbers were T or 5T for the Speed Twin, T100 for Tiger 100, 3T for 350 twin & TR5 for Trophy.
Typical numbers were thus:
8-T-1234 ( 1938 Speed Twin )
47-5T-23456 ( 1947 Speed Twin )
9-T100-45678 ( 1939 Tiger 100 )
Pre-war frames ( 1937 / 39 ) used the prefix TH for the 500cc models ( 5T & T90 ) and TF for the Tiger 100.
Engine numbers commenced at:
1946 - 72000
1947 - 79046
1948 - 88782
1949 - 100762
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