The obol was the currency of the Ionian Islands

Ionian Islands

The Ionian Islands are a group of islands in Greece. They are traditionally called the Heptanese, i.e...

 between 1819 and 1863. Until 1834, 1 obol = 4 lepta (singular lepton), after which 1 obol = 5 lepta. Throughout its existence, the obol was equal to a British half penny. The obol replaced a series of countermarked coins denominated in Turkish paras

Turkish lira

The Turkish lira is the currency of Turkey and the de facto independent state of the Turkish Republic of Northern Cyprus. The lira is subdivided into 100 kuruş...

 and copper gazete

Ionian gazeta

The gazeta was a currency issued in the Ionian Islands in 1801 during the occupation by Russia and the Ottoman Empire. It replaced the Venetian lira at a rate of 1 gazeta = 2 soldi. After the British took possession of the islands, coins were countermarked in Turkish kuruş for use on the islands...

 coins. The obol was issued by the British and was replaced by the Greek drachma

Greek drachma

Drachma, pl. drachmas or drachmae was the currency used in Greece during several periods in its history:...

when the Ionian Islands were given to Greece, at a rate of 1 drachma = 20 oboli.