Niewmismatic Error Coins

Malaysia Parliament House Series Copper-Clad Steel Cent (1973-1988) With Uniface Strikes And Incomplete Cladding Errors.
Rarity:RRR/UNC

UNIFACE STRIKES ERRORS.
In a normally functioning coinage press, planchets are fed into the striking chamber one at a time. But once in a while, two planchets are fed in together in such a way as to perfectly overlap each other.
The strike converts the two coins into a pair of complementary uniface strikes. The facing surfaces of the two coins end up with no design.
A coin having no design on one of its faces is called an Uniface coin. Full design on one side and other side blank. It occurs when there have been two blank planchets in the press at the same time, the upper blank fully covering the lower coin blank. The upper blank will obstruct the upper die from having the upper design on the lower blank, and the lower blank will obstruct the lower die from having the lower design on the upper blank. So both the blanks become uniface coins.
There are many different variations involving uniface errors. In addition to having a 100% blank obverse or reverse, a coin can be struck off-center, with a blank planchet in the collar which will obstruct one side of the off-center.

INCOMPLETE CLADDING ERRORS 
A copper clad-steel one cent coin is involved plating the coin to give it a copper appearance. Planchets missing layers are thinner that normal planchets and, therefore, these errors show a noticeable weakness in the design especially along the edge of the coin. These errors can be dramatic because the pure steel of the coin is exposed. This grey inner material is a sharp contrast to the bright red-brown appearance on the other part of the coin.