The first heptagonal coin was created by Britain's Royal Mint. It was
a British 50 pence coin, first issued in 1969. Since then the
heptagonal format has been used around the world. I've gone through
the alphabet, trying to find, for each letter, a country with a
heptagonal coin or coins. To have a look at the illustrated topic,
click on the link below:
http://www.worldofcoins.eu/forum/index.php/topic,9903.0.html
Phil.