Hi friends, i want help from you. I have Rs.1 Indira Gandhi coin, year 1984 and wearing Mala, but i want do test on it. I don't no which test applicable, Please give me suggestion.

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You can do the following Tests:

1.Find out which metal was used to mint it (or mould by someone)& Weight.
2.Check the mint mark below the date.
3.Refer in all 5 Govt. Mints whether they produced it or not.

If none are true from above... your coin is fake or else its true coin.