10 Euro Cents

Montenegro struck euro-denominated coins from 2002 onward despite having no formal agreement with the European Union — it had adopted the Deutsche Mark unilaterally in 1999 following the Kosovo crisis, then simply switched to euros when the eurozone launched. These pieces were never legal tender outside Montenegro and were not recognized by the ECB, making them something closer to a national token issue than true circulating coinage. The EU eventually formalized Montenegro's monetary arrangement in 2002, but the right to mint remained restricted, and domestic production runs were limited.