South Korea's Hanwha Aerospace said on Thursday it signed a $1.64 billion deal to supply 72 Chunmoo rocket artillery units to Poland, part of an estimated $22 billion agreement Seoul reached with Poland in 2022.

Poland had already agreed on terms to acquire 218 Chunmoos as part of the 2022 deal, which was South Korea's largest-ever arms sale.

Hanwha Aerospace said in a statement that the latest deal would take effect only after a separate financial contract, with government support, is signed by the end of November.

A delegation headed by Poland's deputy defence minister, Pawel Bejda, visited South Korea this week, as South Korean media reports said Polish officials are visiting state-backed export credit agencies (ECAs), including the Export-Import Bank of Korea, to negotiate over financing.

Korea Eximbank declined to comment. (Reporting by Joyce Lee; Editing by Jacqueline Wong and Gerry Doyle)