Portuguese euro coins show three different designs for each of the three series of coins. However, they are quite similar in that all contain old royal mints and seals within a circle of seven castles and five coats of arms and the word “Portugal”. Also featured in the designs, all done by Vitor Manuel Fernandes dos Santos, are the 12 stars of the EU and the year of minting.
For images of the common side and a detailed description of the coins,
see
euro coins – common side depiction.
Depiction of Belgian euro coinage | Obverse side