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BSA Owners Club - UK.  Machine Dating Information.
Seq.  Engine Engine Start Frame Frame Start  
No. Year Model Prefix Number Prefix Number C.C.
1941 C10 WC10 101 WC10 101 250
1941 C11 WC11 101 WC11 101 250
1941 B30 WB30 101 WB30 101 350
1941 C12 WC12 101 WC10 101 350
1941 W.D. M20 WM20 31879 WM20 31879 500
1941 W.D. M20 WM20 40939 WM20 40939 500
1941 W.D. M20 WM20 45669 WM20 45669 500
1941 W.D. M20 WM20 50549 WM20 50549 500
1942 W.D. M20 WM20 55429 WM20 55429 500
1942 W.D. M20 WM20 60309 WM20 60309 500
1942 W.D. M20 (ESTIMATED) WM20 70000 WM20 70000 500
1943 W.D. M20 (ESTIMATED) WM20 90000 WM20 90000 500
1944 W.D. M20 (ESTIMATED) WM20 11000 WM20 11000 500
1945 C10 XC10 101 XC10G 101 250
1945 C11 XC11 101 XC10G 101 250
1945 B31 XB31 101 XB31 101 350
1945 M20 XM20 101 XM20 101 500
1946 C10 GIRDER FORK XC10 101 XC10G 101 250
1946 C10 TELESCOPIC FORK XC10 101 XC10T 101 250
1946 C11 GIRDER FORK XC11 101 XC10G 101 250
1946 C11 TELESCOPIC FORK XC11 101 XC10T 101 250
1946 B31 XB31 101 XB31 101 350
1946 B32 COMPETITION XB32 101 XB31 101 350
1946 M20 XM20 101 XM20 101 500
1946 M21 XM21 101 XM20 101 600
1947 C10 XC10 101 XC10T 101 250
1947 C11 XC11 101 XC10T 101 250
1947 B31 XB31 101 XB31 101 350
1947 B32 COMPETITION XB32 101 XB31 101 350
1947 A7 XA7 101 XA7 101 500
1947 B33 XB33 101 XB31 101 500
1947 B34 COMPETITION XB34 101 XB31 101 500
1947 M20 XM20 101 XM20 101 500
1947 M21 XM21 101 XM20 101 600
1948 C10 YC10 101 YC10 101 250
1948 C11 YC11 101 YC11 101 250
1948 B31 YB31 101 YB31 101 350
1948 B32 COMPETITION YB32 101 YB31 101 350
1948 A7 YA7 101 YA7 101 500
1948 B33 YB33 101 YB31 101 500
1948 B34 COMPETITION YB34 101 YB31 101 500
1948 M20 YM20 101 YM20 101 500
1948 M33 YM33 101 YM20 101 500
1948 M21 YM21 101 YM20 101 600
1949 D1 BANTAM YD 101 YD1 101 125
1949 C10 ZC10 101 ZC10 101 250
1949 C10 AUSTRALIA ZC10A 101 ZC10 101 250
1949 C11 ZC11 101 ZC10 101 250
1949 B31 ZB31 101 ZB31 101 350
1949 B31 PLUNGER ZB31 101 ZB31S 101 350
1949 B32 COMPETITION ZB32 101 ZB31 101 350
1949 B32 COMPETITION PLUNGER ZB32 101 ZB31S 101 350
1949 B32GS GOLD STAR ZB32GS 101 ZB31 101 350
1949 B32GS GOLD STAR PLUNGER ZB32GS 101 ZB32S 101 350
1949 A7 ZA7 101 ZA7R 101 500
1949 A7 PLUNGER ZA7 101 ZA7S 101 500
1949 A7S STAR TWIN PLUNGER ZA7S 101 ZA7S 101 500
1949 B33 ZB33 101 ZB31 101 500
1949 B33 PLUNGER ZB33 101 ZB31S 101 500
1949 B34 COMPETITION ZB34 101 ZB31 101 500
1949 B34 COMPETION PLUNGER ZB34 101 ZB31S 101 500
1949 B34GS GOLD STAR ZB34GS 101 ZB31 101 500
1949 B34GS GOLD STAR PLUNGER ZB34GS 101 ZB32S 101 500
1949 M20 ZM20 101 ZM20 101 500
1949 M33 ZM33 101 ZM20 101 500
1949 M21 ZM21 101 ZM20 101 600
1949 M21 BATAVIA ZM21 101 ZM20 2201 600
1950 D1 BANTAM WITH WICO PACY ELECTRICS YD 20001 YD1 20001 125
1950 D1 BANTAM WITH LUCAS ELECTRICS YDL1 101 YD1 20001 125
1950 D1 BANTAM WITH WICO PACY ELECTRICS PLUNGER YD 20001 YD1S 20001 125
1950 D1 BANTAM WITH LUCAS ELECTRICS PLUNGER YDL1 101 YD1S 20001 125
1950 D1 BANTAM WITH WICO PACY ELECTRICS PLUNGER GPO YD 122001 YD1S 20901 125
1950 C10 ZC10 4001 ZC10 10001 250
1950 C10 Australia ZC10A 101 ZC10A 4001 250
1950 C11 ZC11 8001 ZC10 10001 250
1950 B31 ZB31 8001 ZB31 9001 350
1950 B31 PLUNGER ZB31 9001 ZB31S 5001 350
1950 B31 ALLOY MOTOR ZB31A 9001 ZB31 9001 350
1950 B31 ALLOY MOTOR PLUNGER ZB31A 9001 ZB31S 5001 350
1950 B32 COMPETITION ZB32 3001 ZB31 9001 350
1950 B32 COMPETITION PLUNGER ZB32 3001 ZB31S 5001 350
1950 B32 COMPETITION ALLOY MOTOR ZB32A 3001 ZB31 9001 350
1950 B32 COMPETITION ALLOY MOTOR PLUNGER ZB32A 3001 ZB31S 5001 350
1950 B32GS GOLD STAR ZB32GS 2001 ZB31 9001 350
1950 B32GS GOLD STAR PLUNGER ZB32GS 2001 ZB32S 2001 350
1950 A7 ZA7 7001 ZA7 4001 500
1950 A7 PLUNGER ZA7 7001 ZA7S 6001 500
1950 A7S STAR TWIN PLUNGER ZA7S 4001 ZA7S 6001 500
1950 B33 ZB33 4001 ZB31 9001 500
1950 B33 PLUNGER ZB33 4001 ZB31S 5001 500
1950 B33 ALLOY MOTOR ZB33A 4001 ZB31 9001 500
1950 B33 ALLOY MOTOR PLUNGER ZB33A 4001 ZB31S 5001 500
1950 B34 COMPETITION ZB34 2001 ZB31 9001 500
1950 B34 COMPETITION PLUNGER ZB34 2001 ZB31S 5001 500
1950 B34 COMPETITION ALLOY MOTOR ZB34A 2001 ZB31 9001 500
1950 B34 COMPETITION ALLOY MOTOR PLUNGER ZB34A 2001 ZB31S 5001 500
1950 B34GS GOLD STAR ZB34GS 2001 ZB31 9001 500
1950 B34GS GOLD STAR PLUNGER ZB34GS 2001 ZB32S 2001 500
1950 M20 ZM20 4001 ZM20 7001 500
1950 M33 ZM33 4001 ZM20 7001 500
1950 M21 ZM21 5001 ZM20 7001 600
1950 M21 DUTCH AUTOMOBILE ASSOCIATION ZM21 5001 ZM20D 8426 600
1950 A10 GOLDEN FLASH ZA10 101 ZA7 4001 650
1950 A10 GOLDEN FLASH PLUNGER ZA10 101 ZA7S 6001 650