In the previous week, the reserves had dropped marginally by $286.3 million to $337.793 billion after touching a life-time high of $338.079 billion, a week earlier.
The FCAs, a major constituent of overall reserves, declined by $1.975 billion to $310.347 billion, the Reserve Bank data showed.
The FCAs, expressed in dollar terms, include the effect of appreciation and depreciation of non-US currencies such as the euro, pound and yen, held in the reserves.
The country's gold reserves remained unchanged at $19.837 billion for the reporting week.
The special drawing rights decreased by $60.8 million to $3.960 billion, and the nation's reserve position with the International Monetary Fund also dipped by $27.1 million to $ 1.585 billion during the reporting week, the data showed.
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