Watch List notes:

Ancient City Of Mathura, Uttar Pradesh. Surasena Maha Janapada. AR 1/2 karshapna (12.00 mm, 1.67 g). 400-350 B.C. Fish above Lion, Taurine below lion and other symbols / Different symbols as proof of being reused planchet. Rajgor Series Type 76. VF, Extremely Rare Variety. 

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