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The Link to various articles, Proof Set, Currencies, Definitive is here.
Part 1 Cupro-Nickel
Part 2 - Cupro-Nickel
Part 3 Stainless Steel Issues
Part 1 CuproNickel
Part 2 Stainless Steel
Part 0 - Lion Varieties
Part 1 - Cupro-Nickel Big Coins
Part 2 - Cupro - Nickel
Part 3 - Cupro-Nickel / Stainless Steel
Part 4 - Nickel-Brass
Part 5 - Nickel-Brass with Rupee Symbol
Part 6 - Nickel-Brass with Rupee Symbol
Part 1 - Silver Coins
PS: Incase any of the links are not working, please leave a comment so that I can rectify this.