Punch Marked Coin, Post-Mauryan,  Bengal-Chandraketugarh Region (200-100 BC), Copper Karshapana, Obv: three punch marks including a spoked wheel, two circles enclosing dots, six dumbbells around, and a boat (representing riverine trade-in Bengal), Rev: a single punch mark comprising a conch shell (Shankha), 2.22g, 14.4x12.2mm, (Hardekar, 2019 # BR 20), choice very fine, Scarce.