1 billon coin 'Jambi Lion'

The Melayu Kingdom, centered on the Batang Hari river basin in what is now Jambi province, controlled a stretch of Sumatra's interior trade networks that connected pepper and gold-producing highlands to coastal entrepôts feeding the broader Indian Ocean exchange. Billon coinage of this type reflects a monetary pragmatism common to Sumatran polities of the period — silver diluted with copper to extend supply without abandoning metallic currency altogether.

The "Jambi Lion" designation is a modern cataloging convenience. Attribution to Melayu rather than neighboring Srivijayan or Malay successor states remains debated among specialists, and the three-and-a-half century date range assigned to this type signals exactly how unresolved the chronology is.