SINGAPORE -

* Iraq's SOMO has sold 1 million barrels of Basra Heavy crude at a premium of 90 cents a barrel above its official selling price (OSP), two trade sources said on Thursday, marking a fall to less than half the premium of its previous sale

* The buyer for the cargo loading on July 8-10 was not immediately known

* Afterwards, SOMO issued another tender to sell 2 million barrels of Basra Heavy crude for loading on July 29-31 which will close on June 24, traders said

* SOMO last sold Basra Heavy crude for June loading at a premium of $2.30 a barrel

(Reporting by Florence Tan; Editing by Gopakumar Warrier and Tom Hogue) ((Florence.Tan@thomsonreuters.com; +65 6870 3497; Reuters Messaging: florence.tan.thomsonreuters.com@reuters.net))