Is there any comprehensive guide or research on the coins which gives all the fundamental knowledge about year rarity, mintage and estimated value etc?
I have that book from 2012 that is quite complete.
I use this site:
https://www.chiefacoins.com/Database/Countries/India.htm
It looks like it was designed in the 1990s but it's quite thorough.
For the full reference of the book mentioned by Frankyboy52:
Stevens & Weir, Uniform Coinage of India 1835 to 1847.
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