About a slot machine or pachinko coin I found

Hi people,

during my last trip di Japan I found a slot machine coin in Tokyo (near Ikebukuro). Here is a picture:

http://imgur.com/EgfoWuA

I don't really belive in luck o such, but I really would like to play this coin the next time I'll return to Japan.

Does anyone know where I could use this coin?

I tried searching "Yūtairiku" on Google, but I found nothing at least in english.

Thank you very much,
Alessandro

http://www.p-world.co.jp/tokyo/yutai-ike.htm
2-8-1, Ikebukuro, Toshima-Ku, Tokyo
Open:10:00-22:45

One medal/coin worth 20 Yen.
If you go to pachinko/slot parlor, you pay 1,000 Yen, the parlor lend you 47 coins/medals(used to be 50), 50 medals with 1,080 Yen because of increased consumer tax(5%��8%).

If you are a 18 yrs or younger, you are not allowed to play on Pachinko/slot machine at parlor.

Thank you very much your answer is very helpful!

i kick myself each time i see the word "pachinko" because when i was in Japan i wanted to play them but i was so shy