1939

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In 1939 BSA had a brochure with a blue and silver print. Inside silver print was also used. This year BSA presented 20 models, although this is deceiving as a few models were listed as both Standard and De Luxe models.
In this year the C11 was introduced and the B20 was dropped. Apparently there were quite some bikes left over from 1938 and these were restamped and had a KJ prefix. These were labeled as the Standard models.
The M24 Gold Star was made for the second and last year. The models B20 and Y13 were dropped.

BSA 1939 models

Model	Description	Remarks
250 c.c. S.V. Model C10 de Luxe	C10 de Luxe or 250 c.c. S.V. The basic 250cc SV model with 3 speed foot gear change and with coil ignition. Petrol tank with oil compartment. Dry sump engine.	Black frame, silver petrol tank with maroon lining.
250 c.c. S.V. Model C11	C10 de Luxe or 250 c.c. O.H.V. The basic 250cc OHV model with 3 speed foot gear change and with coil ignition. Petrol tank with oil compartment. Dry sump engine.	Black frame, silver petrol tank with maroon lining.
250 c.c. O.H.V. Model B21 Standard	B21 or 250 c.c. O.H.V. Standard. The basic 250cc OHV model with hand gear change. Basically a 1938 model with 1939 colour scheme.	Black frame, chrome petrol tank with matt silver panels.
250 c.c. O.H.V. Model B21 de Luxe	B21 or 250 c.c. O.H.V. de Luxe. Upgraded version of the B21 with foot change gearbox with redesigned frame and oil tank.	Black frame, chrome petrol tank with matt silver panels.
250 c.c. S.V. Model B23 Standard	B23 or 350 c.c. S.V. Standard. The basic 350cc OHV model with hand gear change. Basically a 1938 model with 1939 colour scheme.	Black frame, matt silver petrol tank with red and black lining.
350 c.c. S.V. Model B23 de Luxe	B21 or 350 c.c. S.V. de Luxe. Upgraded version of the B23 with foot change gearbox with redesigned frame and oil tank.	Black frame, matt silver petrol tank with red and black lining.
350 c.c. O.H.V. Silver Star Model B24	B24 or 250 c.c. O.H.V. Silver Star. The 350cc OHV Silver Star model was the successor of the Empire Star. The Silver Star name was more in line with the top of line model Gold Star	Black frame, chrome plated petrol tank with matt silver panels. Chrome plated wheels with matt silver centres. Low level exhaust system. optional.
350 c.c. O.H.V. Silver Star Model B24 Two-port	B24 or 250 c.c. O.H.V. Silver Star Two-port. The 350cc OHV Silver Star model with twin port cylinder head and upswept exhaust pipes, The Silver Star was the successor of the Empire Star. The Silver Star name was more in line with the top of line model Gold Star	Black frame, chrome plated petrol tank with matt silver panels. Chrome plated wheels with matt silver centres. Two upswept exhaust pipes. optional.
350 c.c . O.H.V. Competition Model B25	B25 or 350 c.c. O.H.V. Competition. The 350cc OHV competition model based on the B24. With narrow round section chrome plated mudguards, upswept exhaust pipe, 19" rear wheel and 21" front wheel and sump protection plate.	Black frame, chrome plated petrol tank with matt silver panels, chrome plated mudguards, high level exhaust system, 19" rear wheel and 21" front wheel fitted with Dunlop competition tyres, chrome plated wheels with matt silver centres.
350 c.c . O.H.V. Model B26	B26 or 350 c.c. O.H.V. In spite of its name the basic 350cc OHV model with foot gear change.	Black frame, chrome plated petrol tank with matt silver panels. Black wheels.
350 c.c . O.H.V. Model B26 Two-port	B26 or 350 c.c. O.H.V. Two-port. Upgraded version of the B26 with twin port cylinder head and upswept exhaust.	Black frame, chrome plated petrol tank with matt silver panels. Black wheels.
500 c.c . S.V. Model M20 Standard	M20 Standard or 500 c.c. S.V. This year saw the introduction of the 10 bolt cylinder head, the improved timing gear with support plate and the improved tappet chest.	Black frame, chrome plated petrol tank with matt silver panels. Matt silver wheels with black lines. Quickly detachable rear wheel.
500 c.c . S.V. Model M20 de Luxe	M20 de Luxe or 500 c.c. S.V. De luxe version of the improved M20 with 10 bolt cylinder head, the improved timing gear with support plate and the improved tappet chest.	Black frame, chrome plated petrol tank with matt silver panels and instrument panel. Chrome plated wheels with matt silver centres. Quickly detachable rear wheel.
600 c.c . S.V. Model M21.	M20 or 600 c.c. S.V. The 600cc version of the M20 with 10 bolt cylinder head, the improved timing gear with support plate and the improved tappet chest.	Black frame, chrome plated petrol tank with matt silver panels and instrument panel. Chrome plated wheels with matt silver centres. Quickly detachable rear wheel.
500 c.c . O.H.V. Model M22	M22 or 500 c.c. O.H.V. The standard 500 cc OHV type with the 1938 frame and oil tank, with a single low exhaust system.	Black frame, chrome plated petrol tank with matt silver panels. Chrome plated wheel rims with matt silver centres. Quickly detachable rear wheel.
500 c.c . O.H.V. Model M22 Two-port	M22 Two-port or 500 c.c. O.H.V. The upgraded M22 500 cc OHV type with twin port head and upswept exhaust pipes.	Black frame, chrome plated petrol tank with matt silver panels. Chrome plated wheel rims with matt silver centres. Quickly detachable rear wheel.
500 c.c . O.H.V. Silver Star Model M23	M23 Silver Star or 500 c.c. O.H.V. The sporting 500cc OHV type with a new name. It was redesigned, with the improved timing gear with support plate and specially tuned and fitted with low level exhaust system.	Black frame, chrome plated petrol tank with matt silver panels and with instrument panel. Chrome plated wheel rims with matt silver centres. Quickly detachable rear wheel.
500 c.c . O.H.V. Silver Star Model M23 Two-port	M23 Silver Star or 500 c.c. O.H.V. Two-port. The sporting 500cc OHV type with a new name. It was redesigned, with the improved timing gear with support plate and specially tuned and fitted with twin port cylinder head and upswept exhausts.	Black frame, chrome plated petrol tank with matt silver panels and with instrument panel. Chrome plated wheel rims with matt silver centres. Quickly detachable rear wheel.
500 c.c . O.H.V. Gold Star Model M24	M24 or 500 c.c. O.H.V. Gold Star. The redesigned top of the line sporting 500cc OHV type with an alloy cylinder and head with redisnged push rod tunnel. Amal TT carburettor. Available in standard and competition set up. Engines were individually built and bench tested.	Black frame, chrome plated petrol tank with matt silver panels and instrument panel.Front wheel 3.00 x 20" rear wheel 3.50 x 19". Chrome plated wheel rims with matt silver centres. Quickly detachable rear wheel.
9.86 h.p. Vee-Twin Model G14	G14 or 1,000 c.c. Vee-twin. The 986cc sidevalve V-twin with total loss lubrication still soldiering on although looking seriously obsolete.	Black frame, chrome plated petrol tank with matt silver panels, instrument panel in tank. Quickly detachable and interchangeable wheels but still with hand change. Chrome plated wheel with matt silver centres.

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