in 1966, coins were introduced in denominations of 5, 20 and 50 senti and 1 shilingi, with the 5 senti struck in bronze, the 20 senti in nickel-brass (copper-nickel-zinc) and the 50 senti and 1 shillingi in cupro-nickel. cupro-nickel 5 shilingi coins were introduced in 1972, followed by scalloped, nickel-brass 10 senti in 1977. this first series coins set, in circulation from 1966 up to 1984, was designed by christopher ironside obe.