Tripura Kingdom, Amara Manikya (SE 1499-1508/1577-1586 AD), Silver Tanka/ Rupee, Saka Era 1503 (1581), citing queen Amaravati, Obv: a lion walking to the left, flag tied to the shaft, date saka 1503 below, all within a circle, pellets added in the outer border of double arches, Rev: Bengali legend "Srihatte Vijayi/Sri Sri Yutamara Manikya Deva Sri/ Amaravati Devyau" within a square, in four lines, arabesques around, (KM # 92/RB # 172), beautiful iridescent rainbow toning visible, graded & slabbed by NGC as AU55, Extremely Rare.
Note: This coin holds the top-pop position, being the highest graded and known example for its type in the NGC Census.