Medellin, Colombia, 1/2 decimo, 1870, extremely rare, NGC VF 20. Restrepo-257.3; KM-150.2a. Rich toning in rainbow colors (mostly magenta and blue), with even wear and no big problems, on par with two other VF's (among only three or four known) that hammered in recent years for as much as $6250 (Eldorado), an important key in the series.
Estimate: 1000 - 1500 USD