Serial Number Guide

Triumph

500cc & 650cc Pre-Unit Engines

1950	100N and up
1951	101NA thru 15808NA
1952	15809NA thru 25000NA Then 25000 thru 32302
1953	32303 thru 44134
1954	44135 thru 56699
1955	56700 thru 70929
1956	70930 thru 82799 Then 0100 thru 0944
1957	0945 thru 011115
1958	011116 thru 020075
1959	020076 thru 029363
1960	029364 thru 030424 Then D101 thru D7726
1961	D7727 thru D15788
1962	D15789 and on

500cc Unit Engines

1957	H101 thru H760
1958	H761 thru H5484
1959	H5485 thru H11511
1960	H11512 thru H18611
1961	H18612 thru H25251
1962	H25252 thru H29732
1963	H29733 thru H32464
1964	H32465 thru H35986
1965	H35987 thru H40527
1966	H40528 thru H49832
1967	H49833 thru H57082
1968	H57083 thru H65572
1969	H65573 thru H67331
1970	KD27850 and up

650cc Unit Engines

1963	DU101 thru DU5824
1964	DU5825 thru DU13374
1965	DU13375 thru DU24874
1966	DU24875 thru DU44393
1967	DU44394 thru DU66245
1968	DU66246 thru DU85903
1969	DU85904 thru DU90282

Triumph 650cc & 750cc Twins and 750 Triples

Beginning in 1969, Triumph started using a 2-letter prefix for frame and engine numbers. The first letter indicates the month of manufacture. The second indicates the year of manufacture.

Month		Year
January	A	1969	C
February	B	1970	D
March	C	1971	E
April	D	1972	G
May	E	1973	H
June	G	1974	J
July	H	1975	K
August	J	1976	N
September	K	1977	P
October	N	1978	X
November	P	1979	A
December	X	1980	B

1981-83 Triumph Engine Numbers

1981	KDA
1982	EDA
1983	BEA

BSA

250cc B25, C25

1967	From C25-101
1968	From B25-101
1969	From KC06301-B25S
1970	From JD00101-B25S
1971	From JE00101-B25SS

441cc B44 Victor Special

1966	B44E-101
1967	B44EA-101
1968	B44B-101
1969	PC07723-B44VS
1970	HD00101-B44VS

441cc B44 Shooting Star

1967	B44R-101
1968	B44B-101
1969	PC07793-B44SS
1970	JC00101-B44SS

500cc B50 All Models

1971	JE00101
1972	JG00101
1973	Not Published

500cc & 650cc A50 & A65

1962-65	Not Published
1966	A50/A65 * 101
1967	A50/A65 * A101
1968	A50/A65 * B101
1969	A50/A65 * C101
1970	A50/A65 * HD00101
1971	A65 * JE00101
1972	A65 * JG00101
* Insert model letter of motorcycle here. H = Hornet L = Lightning F = Firebird S = Spitfire T = Thunderbolt

750cc A75 Triples

1969-70	A75R-101
1971	HD00101-A75R
1972	JG00101-A75R
1973	Not Published

Norton

Norton Year Codes for Models Between 1946 and 1960

Code	Year
A	1946
B	1947
C	1948
D	1949
E	1950
F	1951
G	1952
H	1953
J	1954
K	1955
L	1956
M	1957
N	1958
P	1959
R	1960

Norton Model Codes

Code	Model
2	16H
3	18
3T	500T
4	ES2
6	19R
7	Big 4
8	16H or Big Four Plunger
9	19S
10	International 40
10M	Manx 40
10M2	Manx 40 Featherbed
11	International 30
11M	Manx 30
11M2	Manx 30 Featherbed
12	Model 7
122	88
13	50
14	99
15	77 & Nomad
16	Nomad
17	Jubilee
18	All 650cc Twins
19	Navigator
20	Atlas
20M3	Commando (Distributor)
20M3S	Commando (Camshaft Pionts)
50	AMC 50
ES	Electra
ES2	AMC ES2
D	De-Luxe Twin
SS	Sports Special Twin
Q	Quietening Ramp Cams

Norton Serial Numbers

Year	Number
1945	1001
1946	2131
1947	7756
1948	13792
1949	20701
1950	27100
1951	35560
1952	42700
1953	48900
1954	55350
1955	60700
1956	66600
1957	71360
1958	77400
1959	80488
1960	87038
1961	94500
1962	101060
1963	105000
1964	108000
1965	111650
1966	115870
1967	119760
1968	124300
1969	130000
1970	134700
1971	141700
1972	200001
1973	212278
1973	300000 (850)
1974	307311
1975	325000 (MK3)
	125001 (Frame)

Norton 750 Twins Numbers

750cc Twins
1963	From 104001
1964	From 108000
1965-68	From 114870
1969-70	From 138973
1971	From 142151
1972	From 200004
1973-74	From 301000
1975	From 330000