 The first model to be commercially manufactured was the Mk I in 1963 . An updated version , the Mk II , was released the following year which featured the full set of sounds selectable by banks and stations . The instrument was expensive , costing £ 1 @,@ 000 , at a time when a typical house cost £ 2 @,@ 000 – £ 3 @,@ 000 . 
