Five punch-mark symbols / Blank, a number of bankers' marks. Irregular flat silver plachet, 20x16 mm, 3.21 grams. Gupta/Hardaker ISPC series IVb, XX A 5 (#376).Extremely rare, with only a single published example.These silver coins with various punchmarks are among the earliest silver Indian coins. This coin is not broken, but simply struck on an odd flan.Coins of the Sisunagas (series IVa-IVc) are all rare and difficult to find - it is likely that most of these coins were melted and reissued by the Nandas (series IVd). The dynasty of Sisunagas spanned almost 80 years - the Kings were:Sisunaga (Shishunaga) - ca.413-395 BCKalashoka - ca.396-367 BC10 sons of Kalashoka - ca.367-345 BCMagadha was an ancient kingdom in India, mentioned in both the Ramayana and the Mahabharata. It was also one of the four main kingdoms of India at the time of Buddha, having risen to power during the reigns of Bimbisara (c. 544-491 BCE) and his son Ajatashatru (c. 491-460 BCE). The core of the kingdom was that portion of Bihar lying south of the Ganges, with its capital at Rajagriha (modern Rajgir). Magadha expanded to include most of Biharand parts of Bengal with the conquest of Anga, and then expanded up theGanges valley annexing Kosala and Kashi.