The 10.5hp was a car produced by Calthorpe between 1919 and 1923. It is not known how many were made.
The car was fitted with a 1261cc 4 cylinder engine. The engine had side valves and was connected to a three speed (later four speed) gearbox via a multi-plate (later single plate) clutch. Later the Claudel-Hobson carburettor was replaced by a Zenith unit. The engine produced 40bhp and the top speed of the car was 60mph (97kmh).
The wheelbase was 8ft 3in long and the car had semi-elliptical leaf springs all round.
A wide range of bodies were available including a two-seater sports that was finished in polished aluminium. This was also available with some engine modifications such as lightened con rods, special alloy pistons and a high lift camshaft.
The two-seater cost £525 in 1919 and £240 in 1924.
Some of the cars were converted to single-seaters and raced around Brooklands.