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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.
1921 6/7 HP TWIN 100 T 100 770
1922 4.25 HP H2 or K2 R 2 B 109 550
1922 4.5 HP  DE LUXE H 105 K 1 550
1922 6/7 HP TWIN 2117 A 1 770
1923 2.75 HP 100 D 1 350
1923 4.25 HP H2 or K2 R 2 B 109 550
1923 4.5 HP DE LUXE H 105 K 1 550
1923 6/7 HP TWIN 2117 A 1 770
1923 8 HP TWIN 1 M 2100 1000
1924 2.49 HP STANDARD B 1 BR 9400 250
1924 2.75 HP 100 D 1 350
1924 3.5 HP L 6501 P 1 350
1924 4.98 HP DE LUXE 6000 S 1300 500
1924 4.5 HP LIGHT H 320 B 7680 550
1924 8 HP TAXI 717 W 1000
1924 8 HP TWIN 1 M 2100 1000
1924 8 HP TWIN COLONIAN 1070 1 1000
1925 2.49 HP STANDARD DE LUXE B 9800 BR 9400 250
1925 3.49 HP F 1 294 350
1925 3.49 HP F 1 F 1 350
1925 3.49 HP OHV SUPER 350
1925 3.5 HP L 6501 P 1 350
1925 4.5 HP LIGHT H 320 B 7680 450
1925 4.98 HP DE LUXE 6000 S 1300 500
1925 7.70 HP DE LUXE 1060 N 1 750
1925 7.70 HP LIGHT 7390 V 1 750
1925 9.86 HP COLONIAL 1330 L 1 1000
1925 9.86 HP DE LUXE 1341 W 2907 1000
1925 9.86 HP LIGHT 1270 W 1 1000
1926 2.49 HP STANDARD DE LUXE B 2440 BR 24800 250
1926 3.49 HP F 1 294 350
1926 3.49 HP F 1 F 1 350
1926 3.49 HP OHV SUPER 350
1926 4.93 HP STANDARD M 4000 GM 4000 500
1926 4.98 HP DE LUXE M 100 U 1 500
1926 4.98 HP STANDARD M 100 G 1 500
1926 5.57 HP  DE LUXE H 3923 K 20(x) 550
1926 5.57 HP LIGHT B 3927 B 13000 550
1926 7.70 HP DE LUXE 1060 N 1 750
1926 7.70 HP LIGHT 7390 V 1 750
1926 9.86 HP COLONIAL 1330 L 1 1000
1926 9.86 HP DE LUXE   1341 W 2907 1000
1926 9.86 HP LIGHT 1270 W 1 1000
1927 2.49 HP STANDARD DE LUXE B 30900 BR 31000 250
1927 3.49 HP OHV SUPER D 100 Z 9474 350
1927 4.93 HP SLOPER OHV P 2500 P 2500 500
1927 4.93 HP STANDARD AND SPECIAL SPORTS M 3955 GM 5741 500
1927 4.98 HP DE LUXE  M 8258 U 4000 500
1927 5.57 HP  H 6000 U 4933 550
1927 7.70 HP DE LUXE  A 100 N 5231 750
1927 7.70 HP LIGHT A 100 V 3500 750
1927 9.86 HP DE LUXE C 100 N 5134 1000
1928 1.74 HP 2 STROKE N 103 E 101 150
1928 2.49 HP B 35117 B 36404 250
1928 3.49 HP  F 16680 Z 13982 350
1928 3.49 HP OHV STANDARD L 8820 Z 13982 350
1928 3.49 HP OHV SUPER D 655 Z 13982 350
1928 4.93 HP M 13304 GM 9343 500
1928 4.93 HP  M 15874 U 8735 500
1928 4.93 HP SV SLOPER J 101 P 3789 500
1928 4.93 HP OHV SLOPER P 3217 P 3789 500
1928 5.57 HP  H 4521 U 8735 550
1928 7.70 HP TWIN A 969 N 6001 750
1928 9.86 HP TWIN C 400 N 6001 1000
1929 1.75 HP STANDARD 2 STROKE N 1270 E 1640 150
1929 1.75 HP STANDARD DE LUXE 2 STROKE Y 1 E 1 150
1929 2.49 HP B29 DE LUXE B 42108 B 47120 250
1929 3.49 HP L29 DE LUXE E 19501 Z 19501 350
1929 3.49 HP L29 OHV  L 10501 Z 19501 350
1929 3.49 HP L29 OHV 2 PORT SLOPER D 1801 J 101 350
1929 4.93 HP S29 2 PORT LIGHT K 101 H 101 500
1929 4.93 HP S29 SV SLOPER J 101 P 8500 500
1929 4.93 HP S29 OHV 2 PORT SLOPER P 8850 P 8500 500
1929 4.93 HP S29  S 101 P 8500 500
1929 4.93 HP S29 STANDARD M 9300 G 5990 500
1929 4.93 HP OHV DIRT TRACK T 101 R 101 500
1929 5.57 HP H29 DE LUXE H 8600 P 9040 550
1929 7.70 HP E29 A 1740 V 5001 750
1929 7.70 HP E29 DE LUXE C 1850 N 6760 750
1929 9.86 HP G29 WORLD TOUR C 1850 N 6760 1000
1930 1.74 HP A30 2/3 SPEED 2 STROKE Y 101 E 101 150
1930 2.49 HP B30 - 3 XM 101 XB 101 250
1930 2.49 HP B30 - 4 OHV XR 101 XB 101 250
1930 3.49 HP L30 - 11 OHV DELUXE XV 101 XH 101 350
1930 3.49 HP L30 - 5 XT 101 XB 101 350
1930 3.49 HP L30 - 6 COMMERCIAL XT 101 XA 101 350
1930 4.93 HP S30 - 12 OHV XW 101 XX 101 500
1930 4.93 HP S30 - 13 OHV DE LUXE XP 101 XH 101 500
1930 4.93 HP S30 - 18 LIGHT XU 101 XL 101 500
1930 4.93 HP S30 - 19 OHV LIGHT XO 101 XL 101 500
1930 4.93 HP S30 - 7  XS 101 XH 101 500
1930 4.93 HP S30 - 9 DE LUXE XS 101 XH 101 500
1930 5.57 HP H30 - 10 DE LUXE XX 101 XH 101 550
1930 5.57 HP H30 - 8  XX 101 XH 101 550
1930 7.70 HP E30 - 14 TWIN XY 101 XD 101 750
1930 9.86 HP G30 - 15 TWIN XZ 101 XD 101 1000
1930 9.86 HP G30 -16 TWIN WORLD TOUR XZ 101 XG 101 1000