1972 onwards - Lanka

Republic of Sri Lanka

1972. Ceylon becomes a republic, and the obverse of coin is replaced with the coat of arms of Sri Lanka.
The Sri is added to the name in Sinhala on the coins.

1972 - 1996 - Sri Lanka Definitive issue coins.

srilanka_ Armorial_Ensign
1957 - 1999 - Commemorative Issue coins