Do you know, where in the country has the coin in your wallet been minted? I really do not know about other countries, but in Indian coins, there is one such feature. There is a mark, under the date of issue. There are four types of marks and the mints which produce coins are- The mint in Noida (In NCR or national capital region),
in Hyderabad, in Mumbai and in Kolkata.

The specified marks-                  Mumbai- A Diamond
                                                  Noida-    A Circle
                                                  Hyderabad- A star
                                                  Kolkata-  Nothing!

So take that coin and check it out!