March 28 (SeeNews) - Hungarian producer and distributor of industrial, medical and specialty gases Messer Hungarogaz said on Monday it is now offering 12.33 marka ($6.9/6.3 euro) per share in its buyout bid for Bosnian natural gas distributor Plin Sajarevo [SAJ:PLINKRK1], 2.33 marka per share above it initial offer.