The senti is the subunit of the Estonian kroon which was replaced by the euro last year. This coin was minted in 1992, close to a year after Estonia’s independence following the collapse of the USSR. Estonia had been a soviet republic since World War Two, but it was the republic which always had the closest connections with the west. Today Estonia is one of the most successful ex-communist countries.
The independence of Estonia also saw the return of the three lions from the coat of arms (where they’re blue). The lions have many similarities with the three lions of the Danish coat of arms and this is because Estonia actually was under Danish occupation during the 13th and 14th century.