A MULE IS COIN MINTED WITH OBVERSE AND REVERSE DESIGNS THAT ARE NOT NORMALLY SEEN ON THE SAME COIN. SUCH COINS ARE MINTED WITH OBVERSE DIE OF ONE COIN AND REVERSE DIE OF ANOTHER COIN. IN THIS UNC SET 75 YEARS OF RBI 5 RS OBVERSE DIE STRUCK INSTEAD OF C. SUBRAMANIAM 5 RS OBVERSE