Valerius Gratus, countermarked prutah struck year 25 C.E. in Jerusalem (GBC 1340a) 1.81 g.
A common coin of Gratus overstruck by a countermark in exceptional condition.
References:
2007: Aaron J. Kogon: Countermarks on Small Judean Coins. Israel Numismatic Research Vol. 7 pp. 93-106
1992: Kenneth Lonnqvist: New Vistas on the Countermarked Coins of the Roman Prefects of Judaea. Israel Numismatic Journal Vol. 12 pp. 56-70 Estimate: 2000-2200