Watch List notes:

Kausambi Region, Allahabad. Vatsa Maha Janapada. AR karshapna (24.23 mm, 3.29 g). ABBC type. Struck 500-400 B.C. pair of wheels, Vatsa royal mark of scorpion, what looks like a plough / Symbols of reused planchet of Kalinga Janapada. Unpublished, Variant of Rajgor Series 78 type 1210. VF. Very Rare.

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