BSA Number Data

VIN #s BSA Unit Twins, 1962-65 1962 Eng./Frame 1963 Eng./Frame 1964 Eng./Frame 1965 Eng./Frame
A50	A50-101/A50-101 A50-823/A50-2288 A50A-101/A50-5501 A50A-686/A50- 8437
A50 (Police)	A50AP-101/A50-5501 A50AP-121/A50-8437
A50C (USA)	A50B-101/A50B-101 A50D-101/A50B-4001
A50CC (USA)	A50B-507/A50B-4001
A50C & A50CC (UK)	A50DC-101/A50B-4001
A65	A65-101/A50-101 A65-1947/A50-2288 A65A-101/A50-5501 A65A- 1134/A50-8437
A65 (Police)	A65AP-101/A50-5501 A65AP-267/A50-8437
A65R	A65B-101/A50-5501 A65B-334/A50-8437
A65R (Rev counter)	A65C-101/A50-5501 A65C-1082/A50-8437
A65T/R	A65B-101/A50-5501
A65L/R	A65D-101/A50B-101 A65D-1742/A50B-4001
A65SH	A65E-101/A50B-101 A65E-701/A50B-4001
A65L & A65LC	A65DC-2158/A50B-4001
BSA Unit Twins, 1966-69 1966 Engine 1967 Eng. & Frame 1968 Eng. & Frame 1969 Eng. & Frame
A50 Royal Star	A50R-101 A50RA-101 A50RB-101 A50RC-101
A50 Wasp	A50W-101 A50WA-101 A50WB-101
A65 Thunderbolt	A65T-101 A65TA-101 A65TB-101 A65TC-101
A65 Lightning	A65L-101 A65LA-101 A65LB-101 A65LC-101
A65 Hornet	A65H-101 A65HA-101
A65 Firebird	A65FB-101 A65FC-101
A65 Spitfire	A65S-101 A65SA-101 A65SB-101
Frame No.	All Models A50C-101

Model Year	Model Codes
1969-70	D175, D175B, B25S, B44SS, B44VS, A50R, A65T, A65L, A65F, A75
1971	D175, B25SS, B25T, A65FS
1971-72	B50SS, B50T, A65T, A65L, A75, A75V
1971-73	B50MX
1972	A70L

1969 and onwards:

For the models produced after 1969 a new coding system (numbers) was introduced using a two letter prefix for the month and model season year.

First Letter Code
Letter	Month
A	January
B	February
C	March
D	April
E	May
G	June
H	July
J	August
K	September
N	October
P	November
X	December

Second letter Code
Letter	Model Year
C	Aug 1968 - July 1969
D	Aug 1969 - July 1970
E	Aug 1970 - July 1971
G	Aug 1971 - July 1972
H	Aug 1972 - July 1973

(Courtesy BSA Club of NSW Australia)