|photo: Malaysia 20 cent blank planchet|
I bought this piece of error coin two years ago with price of RM10 from a McDonalds franchise manager. He told me that he got a lot of foreign coins in their McDonalds donation box and this coin was one of them. Even he found a Half Cent of Queen Victoria inside the donation box. I wonder if Singaporeans really had foreign coins inside their wallet. Usually they will take only banknotes for donations purpose and the coins will be used for their changes. That is quite not honest. Then, he as the manager will filter the coins by taking out foreign coins.
The dimension and weight of this coin match the dimension and weight of Malaysia 20 cent. If this error coin is genuine, this is categorized under the blank coin type. There are many types of error coins, such as double strike, wrong planchet, off centering, low strike, off strike, mirror strike and others. From my survey at the Internet, blank coin error coins are the easiest to find compare to other types.
There are two types of blank coins. The first type is without raised rim on it. In this case, the coin is better called as blank coin, as it never involved in any of the coin minting processes. For the second part is with raised rim on it,blank planchet. A planchet is a blank coin that is ready to be stamped by an engraved die. I think my coin here has raised rim on it. The raised rim on the blank planchet means that the coin has undergone at least one process of coin minting, which is softening process. I think softening process soften the surface of the coins to ease the stamping process later.There is probability the blank planchet escape the pressing section and then bagged for circulation.
Counterfeiting exist easily because blank coins are easy to copy and produce. There are few tips on how to differentiate between a genuine and a fake one. First, if the blank coins has milled/reeded edge, most probably it is fake, because milling of the edge and stamping usually occur simultaneously for conventional minting. By the way, one of the objectives of reeded edge is to avoid counterfeiting. Second one, usually blank planchet has smooth and shining surfaces. If the surface is rough, maybe someone had sanded and polished the surface of the coin.
What do you think of my coin here?