NOTE: The odd-shaped coin is is a Byzantine Empire Christ "Cup Coin" (Trachy). This is one of the earliest coin types to bear an image of Christ. I can't guarantee its authenticity, as there are Bulgarian restrikes in existence.
The Roman halved coin is a follus with obverse profile image- to the best of my knowledge, Emperor Licinius (308 to 324)
The Indian coin is 19th century or earlier, as these coins were minted for a very long time.