Singapore 1986 50 cents. Metal: Cupro-Nickel, 7.29g, 24.66mm. Featuring the Arms of Republic of Singapore with the year 1986 with 4 official languages around the circumference of the coins with additional ring of dashes around the arms. It also features yellow allamanda (a poisonious plant which is quite common in Singapore) or better known as Allamanda cathartica.