Solos and Combinations from Birmingham Small Arms
For 1937, BSA offered the following models:
B20 250cc Tourer
B21 250cc OHV Sports, H.C.
B22 250cc OHV Empire Star, F.C.
B23 350cc Tourer, Sidevalve, H.C.
B24 350cc OHV Empire Star, dual exhaust ports and upswept exhaust optional.
B25 350cc OHV Competition, 18/21" wheels, opional exhaust and head as above.
B26 350cc OHV Sports
M19 350cc OHV De Luxe
M20 500cc Tourer
M22 500cc OHV Sports
M23 500cc OHV Empire Star
M21 600cc Tourer
Y13 750cc OHV Twin 7.48 hp
G14 Twin 1000cc