There were two different 20 Paise Aluminium-Magnesium Alloy Commemorative coins issued.
Details as per standard catalog :
Hyderabad Mint : FAO Reverse Side ------------------- a variant of same mint coin : some sort of error coin
Observe of the same coin :
Hyderabad Mint Fishries Coin Reverse Side -------------------Kolkata Mint Fishries Coin Reverse Side
Observe of the same coin :
