Coins Malaysia

It is very difficult to know the exact year number, what else the plain (misprint) part lies in that part. While the other side does not explain anything, just a picture of the keris crossed with a sheath!

The question is really the coin sentenced to 1 Malaysian Ringgit which is currently on me is "misprint" or deliberately I make it a "misprint" or other people who deliberately make it a "misprint"?

The story of this coin until my hand was originally obtained from my mother-in-law while sweeping her yard. Accidentally, on the ground, he saw a display like coins 500 rupiah (because the size is almost the same as coins 500 rupiah). However, when collected, in fact the coin is not coins 500 rupiah. But in the form of a brass metal rounded with brass sculptures crossed with Sarongnya while on the side sebeleh is plain slippery. After so long kept him, eventually this coin was given to me because he saw me have an interest to collect coins or paper money that weird or old.

My person does not have the ability to make coin money so "misprint" (make plain on one side of the coin).