Watch List notes:

India. Narhan hoard type, 600-400 BC, Silver double Karshapana, 7.0 grams, 27.23mm x 18.31mm, Obverse: A central circular blob with a pentagon shape around it and surrounded by dots, a secondary(semi-official) mark of a six-arm symbol, Reverse: Uniface, Very Fine, Very Rare, Reference: Hardaker, Non-imperial series, Type NH35, page. 215.
Hardaker suggests that only one in ten Narhan type coins have the semi-official mark. The similarity of this semi-official mark with the Magadhan Series 1 coins suggest their contemporaneity