There are a lot of differences between Greek coins and Indian ones. Get a book about world coins, and you can learn a lot about how to identify coins.
The value of a 1879 1 rupee Indian coin depends on its condition. This coin in excellent condition is valued between 24.99 and 39.99 as of 2014.
Nothing, just two different abbreviations for Proof.
It is a Greek coin,,, is it worth ?
No U.S. silver dollars have an Indian Head design, so if you have one it's not real. A genuine silver dollar coin dated 1851 would be a Seated Liberty coin. I have seen many 'fantasy' silver rounds with the Indian Head design with different dates, but they all have the 1oz .999 fine silver markings somewhere on the coin.
A proof coin has a special shiny finish on it and it is made to be sold to collectors, and not used as money.
Indian coin is made of stainless steel.
What do you refer to as the "the original AUS coin" and why do you think you have a fake?
They're just alternate names for the same coin. Both uses are about equally common. There's more information at the Related Question.
The Greek word for coin is:κέρμα which is pronounced kérma.
Please check your coin. All Australian 1920 Pennies were minted at either the Melbourne or Sydney Mints. None were minted in London or Calcutta.
The 2007 mint of the Rs. 2 Indian coin.
Coin Dozer is a free App for your phone, Coin Dozer Pro is not free you have to buy it. The difference in gameplay is that Coin Dozer Pro doesn't have advertisements unlike the free version letting you have faster gameplay and a clearer screen.