In Japan, there are a plenty of 10 yen coins, and some of them are known as rare coins.
They are nicknamed “ギザ十(giza-ju),” and had been issued between 1951 and 1958.
The origin of the name of the giza-ju is that they have an engrailed rim（ギザギザした縁の10円玉 : gizagiza shita fuchi no ju-yen dama）.
Therefore, it is easy to find them.
Also, their value is around 15 yen to 50 yen.
When we sometimes noticed the giza-ju, we could feel a little happy.
However, people who don’t know the exist of the giza-ju have increased gradually as the years rolled on.
