UNC stands for Uncirculated and is that highest grade in which a note is availble. UNC currency is not released to the general public, thus its virgin condition. Still it holds value, and is regarded as the highest tier of collectibles
This silver coin is from the Straits Settlements colonial era, and this uncirculated coin is exactly 100 years old. These colonies were dissolved in 1946 and the currency was discontinued ever since. A great addition to any collection, and a symbol of the collector's great taste and deep knowledge.