|The obverse side of the coin depicts Trenčín Castle along with a fragment of the Roman inscription written on the castle rock and an outline of the ramparts. In the lower part of the coin is the state emblem of the Slovak Republic, positioned below the year 2012 and above the country designation SLOVENSKO. On the right edge are the stylised letters KL, the initials of the obverse side’s designer Karol Ličko.|
The reverse side of the coin depicts a design of the Trenčín Historical Preservation Area as viewed from above, showing major architectural landmarks including the castle and triangular square. Along the left-hand edge are the words PAMIATKOVÁ REZERVÁCIA (Historical Preservation Area) and along the right-hand edge is the name TRENČÍN. The denomination 20 EURO appears in the lower-left part of the coin. In the lower part are the mintmark of the Kremnica Mint and the stylised letters MR, the initials of the reverse side’s designer Miroslav Rónai.