The Serbian central bank purchased euros on the local interbank market on Friday to rein in dinar gains, a day after it cut the benchmark rate by 25 basis points to 4 percent, dealers said. The central bank, started intervening with the currency trading at around 123.10 to the euro, or 0.29 percent stronger than the previous close. After the intervention, according to Reuters data, the dinar weakened to 123.35 at around 1220 GMT.