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Arno Motor Co of Arno Motor Works, 85-86 Gosford Hill and of Hill Cross, Coventry were motorcycles produced from 1906 to 1915.
1906 Arno started to produce motorcycles with 3.5 hp sleeve-valve engines.
1908 The Arno was an English automobile manufactured in Coventry only in 1908; the car, which featured a 25 hp White and Poppe engine and shaft drive, was introduced at that year's Stanley Show.
1912 Listed in Spennell's at Gosford St (Tel. 339), Coventry. 
1912 Those two models were joined by a 2.25hp lightweight and a 3.5hp TT version - a basic direct-belt driven machine.
1913 Petition for winding up the business 
1914 The marque took the name Red Arno after the TT model was given a red finish. Both 3.5hp and and 4.5hp were available for a couple of years.
1915 There were no further listings after that year.
See also Western Star
National Motorcycle Museum exhibits:-