Williamson Motor Company Ltd. (1912-1920)
 
 
Typ / Model Production time Capacity Cylinders / Engine Power Serial no. Top speed  
 
Flat Twin
water cooled
1912-1918 964 cm³ 2 cyl. (85 x 85 mm), 4-stroke, side valves, water cooled, horizontally opposed twin-cylinder, Douglas 8 PS    
 
Flat Twin
air cooled
1913-1918 964 cm³ 2 cyl. (85 x 85 mm), 4-stroke, side valves, horizontally opposed twin-cylinder, Douglas 8 PS