Same year, same shape.
Exact match first.
1966 India 1 paisa - Bombay mint

After 1 hour, same coin from any mint
After 2 hours, any 1966 coin from Bombay mint
After 3 hours, any India 1 paisa
After 4 hours, any diamond shape India coin
After 5 hours, any India coin
After 6 hours, any coin.