Watch List notes:

Bengal. 2nd century B.C. BI karshapana (16 mm, 2.90 g). Three punches: a river boat, wheel, and six-armed symbol / One punch: Conch shell symbol. Rajgor Series 4; MATEC 4651. Scarce. Dark toning. Good fine. 

This post-Mauryan series circulated in Chandraketugarh, in modern-day West Bengal.