SEOUL, July 28 (Reuters) - South Korea's Amco, a subsidiary of Hyundai Motor Co , said on Tuesday that it had won a 520 billion won ($420.5 million) deal to construct public housing in Libya. Under the contract with the Libyan government, Amco will build 2,000 houses and related social infrastructure in the city of Qubbah, the company said on its website (www.amco.co.kr). (Reporting Cho Meeyoung; Editing by Chris Lewis) ($1=1236.5 won)