MODEL VERSION

A       US MKT - ROAD (1960)
B       US MKT - COMPETITION (1960)
R       US MKT - ROAD (SOME YRS UK)
RT      US MKT - ONLY 750 MADE (1970)
C        US MKT - COMPETITION
V       FIVE SPEED GEARBOX
E       CONFORMS TO US ENVIRON. REGS.
ES     ELECTRIC START
D        BONNEVILLE SPECIAL (1979-1980)
TSS    EIGHT VALVE ENGINE
TSX     US STYLE CUSTOM
LE      LIMITED EDITION ROYAL (1982)
AV     ANTI VIBRATION (POLICE FRAME)
YEAR

 C       1969
D       1970
E       1971
G       1972
H       1973
J        1974
K       1975
N       1976
P       1977
X       1978
A       1979
B       1980
KDA   1981
EDA   1982
BEA   1983
MONTH         YEAR        SERIAL #        VERSION
      X                A             123456                E
Meriden  Bonneville
SERIAL NUMBERS
T120  650cc
1958 - 1972
T140  750cc 1973 - 1983
In 1969 Triumph changed to a new lettering system as follows
First prefix letter        indicates month of  manufacture
Second prefix letter   indicates model      year
Suffix letter                indicates model      version
source: The Classic MotorCycle - 1997
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PREFIX  LETTERS             SUFFIX LETTERS
MONTH

A      JANUARY
 B      FEBUARY
C      MARCH
D      APRIL
E      MAY
G     JUNE
H     JULY
J      AUGUST
K     SEPTEMBER
N     OCTOBER
P     NOVEMBER X      DECEMBER
2 prefix letters, followed by serial #, then followed by suffix letter
Early  T120's  have a six figure serial number
Duplex framed pre-unit  T120's are prefixed D
Single downtube pre-unit T120's  prefixed DU
Single downtube unit  T120's are prefixed DU
( 1958 - 1960 )  020076 to 030424
( 1960 - 1962 )  D101 to D20308
( 1963 )   DU101 to DU5824
( 1963 - 1970 )  DU5825 to DU90282