it was 7s 6d my research shows kenya used c instead of d since 1921.
You are correct. Kenya and other British colonies in East Africa used the East African schilling as the basic currency unit. It superceded the Rupee in 1919:
It has already been pointed out in a previous paragraph that the British East African Protectorate has a decimal coinage based upon the form. Up till 1919 its principal coin was the rupee, which was legal tender at the rate of 15 to the pound. In order to avoid exchange difficulties this currency was abolished and the form was substituted. To meet the wishes of the mercantile community, however, the decimal subdivision was retained, and British East Africa was thus the first community to establish a variant of the pound-mil system.
The East African schilling was not replaced as Kenyan currency until 1966.
In other words it looks odd. However, again one must remember that this was a transition period in Kenya. As has been pointed out by many posters previously, one has to make a comparison with other similar documents from the same area and the same time period to come to a definite conclusion.