Sultan Ratu Sri Ingalaga (carefully written out in Arabic but in retrograde (left to write) and in mirror image) // Blank. 20mm, 1.13 grams.  cf.Zeno #354843; Numista #-; Millies #-.

Crude legend but still readable. Very interesting - the die for these was engraved normally (not retrograde), resulting in a retrograde inscription on the coin. Such examples are rare, none in Millies.

Sultan Ratu Sri Ingalaga was another name for Sultan Mas'ud Badr ud-Din of Jambi Sultanate (in Sumatra, modern Indonesia).

The Jambi Sultanate was a powerful Malay state located in what is now central Sumatra, Indonesia, flourishing from around the 15th century until the early 20th century. Situated along the Batanghari River, Jambi became a key player in regional trade, especially in pepper, gold, and forest products, linking the interior of Sumatra with international markets. Initially influenced by the Malacca Sultanate, Jambi later navigated complex relations with both regional powers and European colonial forces, including the Dutch and the British. In the 17th century, it reached its height of prosperity and political influence but eventually came under Dutch control by the late 19th century, formally losing its sovereignty in 1907. The Jambi Sultanate is remembered for its strategic role in Sumatran trade networks and its resilience amid colonial encroachment.