Costa Rica
Republic Type IV Countermarked 4 Reales (1846) G4 NGC, San Jose mint, KM50. Countermarked over a Guatemala cob 4 Reales 1746 G-J. Host coin Good though quite choice for the designation since showing a full date, countermark about Fine and clear. Authorized by decree of October 15, 1846, a rare necessity issue in any grade, likely unique as a combination over this rare host coin (rated as RRR in Jara's work on the early issues of the Guatemala mint).
Estimate: 3000-4000 USD