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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.
1912 3.5 HP 2 SPEED 5530 5351 500
1912 4.25 HP 3 SPEED 5530 5351 550
1914 3.5 HP 2 SPEED 8662 8801 500
1914 4.25 HP 3 SPEED 5530 5351 550
1915 4.25 HP CHAIN CUM BELT 3 SPEED 12692 12661 550
1916 4.25 HP CHAIN CUM BELT 3 SPEED 17575 17461 550
1917 4.25 HP CHAIN CUM BELT 3 SPEED 22867 22871 550
1918 4.25 HP CHAIN CUM BELT 3 SPEED 26991 27071 550
1919 4.25 HP CHAIN CUM BELT 3 SPEED 31213 31351 550
  1920 4.25 HP CHAIN CUM BELT 3 SPEED 36965 37901 550
1920 6/7 HP TWIN 100 T 100 770