Hi Debbie , in all there have been 26 countries and territories that made square coins and some of them made rather a lot ( India and the Netherlands ) The "coin" you have in the picture is however not a coin , it is a token from 1989 where on the one side you have a copy of a Dutch coin ( 1939) and on the other side you can get your name engraved . If you are or any other person is interested in square coins you should read world square coins 1900-2000 isbn 978-87-91472-01-05 any good bookshop / coinshop can order it for you , or you may even find it at your local library regards scm collection would get very expensive if you go back before 1900, all those wonderful Klippe coins of the German states, Swedish plate money, and not forgetting Newark siege pieces