Watch List notes:

India, Mauryan empire. Ca. 2nd century B.C. AR karshapana (18.5 mm, 3.34 g). Five punches, including dog jumping right, bull, and river symbol / Bankers' marks. GH 364. Extremely rare.

This variety is rated as XR (Extremely Rare) by Gupta & Hardaker (2014). In fact, this is so rare they had no specimen to illustrate in their catalog.