Watch List notes:

Kausambi Region, Allahabad, Vatsa Maha Janapada. ABBC type. AR karshapna (26.17 mm, 3.33 g). 500-400 B.C. Vatsa royal mark of scorpion, what looks like a Plough. With Beautiful counter marks / Symbols of Reused Planchet. (Unpublished, cf. Rajgor Series 78 type 1210). Good VF, Very Rare. 

This is one of the 16 Major Janapadas also called as Maha Janapadas. This is catalogued by Buddhists in Anaguttara Nikaya