Salatana radao in Javanese script // Blank. 20mm, 0.92 grams.  cf.Zeno #161646; Millies -.

Rare tin coin. Unpublished in the standard references, there are a few examples now posted on Zeno. Probably cast during the reign of the first Sultan, Abdul Jalil Rahmat Shah (1722–1740/46).

The Siak Sultanate (officially the Sultanate of Siak Sri Indrapura) was a powerful Malay Muslim kingdom in eastern Sumatra, in present-day Indonesia, that existed from 1722 to 1949. Founded by Raja Kecil after his unsuccessful attempt to claim the throne of Johor, the sultanate grew into a major regional power by controlling trade along the Siak River and the Strait of Malacca. During the eighteenth century it expanded over much of eastern Sumatra, though its influence gradually declined under Dutch colonial pressure in the nineteenth century. Despite becoming a Dutch protectorate, Siak retained a degree of autonomy until the last ruler, Syarif Kasim II, voluntarily joined the newly independent Republic of Indonesia after World War II. The sultanate is remembered as an important center of Malay culture, Islamic learning, and regional trade in Sumatra.