Ancient Indian coins issued by Gandhara Janapada were rectangular in shape and featured the six-armed symbol whereas Gupta period coins issued between 320 and 550 AD are considered to be the most beautiful coins of ancient India. If have an old coin of India in your collection, then Mintage World is where you will find well-organised information about all types of rare historical coins of India.
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https://www.mintageworld.com/coin/dynasty/17/