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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.
1931 2.49 HP B31 -1 Y1 101 Y1 101 250
1931 2.49 HP B31 -2 OHV Y2 101 Y1 101 250
1931 2.49 HP B31 - 3 OHV DE LUXE Y3 101 Y3 101 250
1931 2.49 HP L31 - 5 POST OFFICE YT 101 Y5 101 250
1931 3.49 HP L31 - 4  Y4 101 Y1 101 350
1931 3.49 HP L31 - 5 DE LUXE Y5 101 Y5 101 350
1931 3.49 HP L31 - 6 OHV DE LUXE Y6 101 Y5 101 350
1931 4.93 HP S31 - 10 OHV DE LUXE Y10 101 Y7 101 500
1931 4.93 HP S31 - 7  Y7 101 Y7 101 500
1931 4.93 HP S31 - 9 OHV Y9 101 Y7 101 500
1931 5.57 HP H31 - 8 DE LUXE Y8 101 Y7 101 550
1931 7.70 HP E31 - 11 TWIN 2 GALLON TANK Y11 101 Y11 101 750
1931 7.70 HP E31 - 11 TWIN 3 GALLON TANK Y11 101 Y11A 101 750
1931 9.86 HP G31 - 12 TWIN WORLD TOUR Y12 101 Y12 101 1000
1932 2.49 HP B32 - 1 OHV Z1 101 Z1 101 250
1932 3.49 HP L32 - 2  Z2 101 Z1 101 350
1932 3.49 HP L32 - 3 OHV Z3 101 Z3 101 350
1932 3.49 HP L32 - 4 DE LUXE HAND CHANGE Z4 101 Z4 101 350
1932 3.49 HP L32 - 4 DE LUXE FOOT CHANGE Z4 101 Z5 101 350
1932 3.49 HP L32 - 5 OHV BLUE STAR HAND CHANGE Z5 101 Z4 101 350
1932 3.49 HP L32 - 5 OHV BLUE STAR FOOT CHANGE Z5 101 Z5 101 350
1932 3.49 HP L32 - 5 OHV DE LUXE HAND CHANGE Z5 101 Z4 101 350
1932 3.49 HP L32 - 5 OHV DE LUXE FOOT CHANGE Z5 101 Z5 101 350
1932 3.49 HP L32 - 5 OHV BLUE START HAND CHANGE Z11 101 Z4 101 350
1932 3.49 HP L32 - 5 OHV BLUE STAR FOOT CHANGE Z11 101 Z5 101 350
1932 4.99 HP S32 - 8 OHV DE LUXE Z8 101 Z8 101 500
1932 4.99 HP W32 - 6 FOOT CHANGE Z6 101 Z7 101 500
1932 4.99 HP W32 - 6 HAND CHANGE Z6 101 Z6 101 500
1932 4.99 HP W32 -7 OHV BLUE STAR FOOT CHANGE Z12 101 Z7 101 500
1932 4.99 HP W32 -7 OHV BLUE STAR FOOT CHANGE Z7 101 Z7 101 500
1932 4.99 HP W32 -7 OHV BLUE STAR HAND CHANGE Z12 101 Z6 101 500
1932 4.99 HP W32 -7 OHV BLUE STAR HAND CHANGE Z7 101 Z6 101 500
1932 4.99 HP W32 - 7 OHV FOOT CHANGE Z7 101 Z7 101 500
1932 4.99 HP W32 - 7 OHV HAND CHANGE Z7 101 Z6 101 500
1932 5.57 HP H32 - 9 DE LUXE Z9 101 Z8 101 550
1932 9.86 HP G32 - 10  Z10 101 Z10 101 1000
1933 2.49 HP B33 - 1  A1 101 A1 101 250
1933 2.49 HP B33 - 2 OHV S.P. A2 101 A1 101 250
1933 2.49 HP B33 - 3 BLUE STAR JUNIOR A3 101 A3L 101 250
1933 3.48 HP R33 - 4 OHV  A4 101 A4 101 350
1933 3.48 HP R33 - 5 OHV BLUE STAR HAND CHANGE A5 101 A4 101 350
1933 3.48 HP R33 - 5 OHV BLUE STAR FOOT CHANGE A5 101 A5 101 350
1933 4.99 HP W33 - 6  A6 101 A4 101 500
1933 4.99 HP W33 - 6 POST OFFICE A6 101 A6 100 500
1933 4.99 HP W33 - 7 OHV  A7 101 A4 101 500
1933 4.99 HP W33 - 8 OHV BLUE STAR FOOT CHANGE A8 101 A5 101 500
1933 4.99 HP W33 - 8 OHV BLUE STAR HAND CHANGE A8 101 A4 101 500
1933 4.99 HP W33 - 9 OHV SPECIAL HAND CHANGE A9 101 A9R 101 500
1933 4.99 HP W33 - 9 OHV SPECIAL FOOT CHANGE A9 101 A9L 101 500
1933 5.95 HP M33 - 10 A10 101 A10 101 600
1933 5.95 HP M33 - 11 OHV A11 101 A10 101 600
1933 9.86 HP G33 -12 TWIN LIGHT A12 101 A? 1000
1933 9.86 HP G33 -13 TWIN WORLD TOUR A13 101 A13 101 1000
1933 9.86 HP G33 -13 TWIN WAR OFFICE A14 101 A14 101 1000
1934 1.49 HP X34 - 0 OHV B150 101 B1 101 150
1934 2.49 HP B34 - 1 B1  101 B1 101 250
1934 2.49 HP B34 - 17 OHV SPORTS B17 101 B3 101 250
1834 2.49 HP B34 -2 OHV B2 101 B1 101 250
1934 2.49 HP B34 - 3 BLUE STAR JUNIOR B3 101 B3 101 250
1934 3.48 HP R34 - 4 OHV B4 101 B4 101 350
1934 3.48 HP R34 - 5 OHV BLUE STAR B5 101 B4 101 350
1934 3.48 HP R34 - 6 OHV SPECIAL B6 101 B6 101 350
1934 4.99 HP W34 - 7 B7 101 B7 101 500
1934 4.99 HP W34 - 8 OHV B8 101 B4 101 500
1934 4.99 HP W34 - 9 OHV BLUE STAR B9 101 B4  101 500
1934 4.99 HP W34 -10 OHV SPECIAL B10 101 B6 101 500
1934 4.98 HP J34 - 11 OHV TWIN B11 101 B11 101 500
1934 5.95 HP M34 - 12  B12 101 B12 101 600
1934 5.95 HP M34 - 13 OHV  B13 101 B12 101 600
1934 9.86 HP G34 - 14 TWIN WORLD TOUR B14 101 B14 101 1000
1935 1.49 HP X35 - 0 OHV E0 101 E1 101 150
1935 2.49 HP B35 - 1  E1 101 E1 101 250
1935 2.49 HP B35 -2 OHV E2 101 E1 101 250
1935 2.49 HP B35 - 3 OHV DE LUXE E3 101 E3 101 250
1935 3.48 HP R35 - 4 OHV DE LUXE E4 101 E3 101 350
1935 3.48 HP R35 -5  OHV BLUE STAR E5 101 E5 101 350
1935 3.48 HP R35 - 17 OHV TWIN PORT E17 101 E5 101 350
1935 4.98 HP W35 - 6  E6 101 E6 101 350
1935 4.98 HP J35 - 12 OHV TWIN E12 101 E12 101 500
1935 4.99 HP W35 - 7 OHV E7 101 E5 101 500
1935 4.99 HP W35 - 8 OHV BLUE STAR E8 101 E5 101 500
1935 4.99 HP W35 - 9 OHV SPECIAL E9 101 E9 101 500
1935 5.95 HP M35 -10 E10 101 E10 101 500
1935 5.95 HP M35 - 11 OHV E11 101 E10 101 600
1935 7.50 HP J35 - 15 OHV TWIN WAR OFFICE E15 101 E15 101 750
1935 9.86 HP G35 - 14 TWIN E14 101 E14 101 1000
1936 1.49 HP X0 OHV D0 101 D1 101 150
1936 2.49 HP B1 D1 101 D1 101 250
1936 2.49 HP B18 OHV LIGHT DE LUXE D18 101 D1 101 250
1936 2.49 HP B2 OHV D2 101 D1 101 250
1936 2.49 HP B3 OHV DE LUXE D3 101 D3 101 250
1936 3.48 HP R4 OHV DE LUXE D4 101 D3 101 350
1936 3.48 HP R17 OHV  D17 101 D6 101 350
1936 3.48 HP R19 OHV COMPETITION D19 101 D3 101 350
1936 3.48 HP R20 OHV NEW BLUE STAR D20 101 D6 101 350
1936 3.48 HP R5 OHV EMPIRE STAR 3D5 101 D38 101 350
1936 3.48 HP R5 OHV EMPIRE STAR D5 101 D8 101 350
1936 4.96 HP Q21 OHV NEW BLUE STAR D21 101 D6 101 500
1936 4.96 HP Q7 OHV D7 101 D6 101 500
1936 4.96 HP Q8 OHV EMPIRE STAR 3D8 101 D38 101 500
1936 4.96 HP Q8 OHV EMPIRE STAR D8 101 D8 101 500
1936 4.98 HP J12 OHV TWIN D12 101 D12 101 500
1936 4.99 HP W6  D6 101 D6 101 500
1936 5.95 HP M10  D10 101 D10 101 600
1936 7.48 HP Y13 OHV TWIN D13 101 D13 101 750
1936 9.86 HP G14 TWIN D14 101 D14 101 1000
1937 B20 TOURER HB20 101 HB20 101 250
1937 B21 OHV SPORTS HB21 101 HB20 101 250
1937 B22 OHV EMPIRE STAR HB22 101 HB20 101 250
1937 B23 TOURER HB23 101 HB20 101 350
1937 B24 OHV EMPIRE STAR HB24 101 HB24 101 350
1937 B25 OHV COMPETITION HB25 101 HB24 101 350
1937 B26 OHV SPORTS HB26 101 HB24 101 350
1937 M19 OHV DE LUXE HM19 101 HM19 101 350
1937 M20 TOURER HM20 101 HM19 101 500
1937 M22 OHV SPORTS HM22 101 HM19 101 500
1937 M23 OHV EMPIRE STAR HM23 101 HM19 101 500
1937 M21 TOURER HM21 101 HM19 101 600
1937 Y13 OHV TWIN HY13 101 HY13 101 750
1937 G14 TWIN HG14 101 HG14 101 1000
1938 B20 TOURER JB20 101 JB20 101 250
1938 B21 OHV SPORTS JB21 101 JB20 101 250
1938 B22 OHV EMPIRE STAR JB22 101 JB20 101 250
1938 C10 JC10 101 JC10 101 250
1938 C11 JC11 101 JC10 101 250
1938 B23 TOURER JV23 101 JV20 101 350
1938 B24 OHV EMPIRE STAR JV24 101 JV24 101 350
1938 B25 OHV OMPETITION JV25 101 JV24 101 350
1938 B26 OHV SPORTS JV26 101 JV24 101 350
1938 M19 OHV DE LUXE JM19 101 JM19 101 350
1938 M20 TOURER JM20 101 JM19 101 500
1938 M22 OHV SPORTS JM22 101 JM19 101 500
1938 M23 OHV EMPIRE STAR JM23 101 JM19 101 500
1938 M24 GOLD STAR JM24 101 JM24 101 500
1938 M21 TOURER JM21 101 JM19 101 600
1938 Y13 OHV TWIN JY13 101 JY13 101 750
1938 G14 TWIN JG14 101 JG14 101 1000
1939 B21 DE LUXE KB21 101 KV20 101 250
1939 B21 STANDARD KJB21 101 KJB20 101 250
1939 C10 DE LUXE KC10 101 KC10 101 250
1939 C10 STANDARD KJC10 101 KJC10 101 250
1939 C11 KC11 101 KC10 101 250
1939 B23 STANDARD KJB23 101 KJB20 101 350
1939 B25 COMPETITION KB25 101 KB24 101 350
1939 B26 KB26 101 KB24 101 350
1939 B23 DE LUXE KB23 101 KB20 101 500
1939 B24 SILVER STAR KB24 101 KB24 101 500
1939 M20 DE LUXE KM20 101 KM20 101 500
1939 M20 STANDARD KMS20 101 KM20 101 500
1939 M22 STANDARD KJM22 101 KJM19 101 500
1939 M23 SILVER STAR KM23 101 KM23 101 500
1939 M24 GOLD STAR KM24 101 KM24 101 500
1939 M21  KM21 101 KM20 101 600
1939 G14 TWIN KG14 101 KG14 101 1000
1940 C10 WC10 101 WC10 101 250
1940 C11 WC11 101 WC10 101 250
1940 B29 SILVER SPORTS WB29 101 WB27 101 350
1940 C12 WC12 101 WC10 101 350
1940 W.D. B30 WB30 101 WB30 101 350
1940 M20 WM20 101 WM20 101 500
1940 M23 SILVER STAR WM23 101 WM20 101 500
1940 W.D. M20   WM20 9719 WM20 9719 500
1940 W.D. M20   WM20 14439 WM20 14439 500
1940 W.D. M20 WM20 18899 WM20 18899 500
1940 W.D. M20 WM20 23039 WM20 23039 500
1940 W.D. M20 WM20 27039 WM20 27039 500
1940 M21 WM21 101 WM20 101 600
1940 G14 TWIN WG14 101 WG14 101 1000