Watch List notes:

Small gold "oro corriente" piece of a small nugget with partial cross stamp applied, 9.19 grams. Roughly 3/4" x 3/8" x 1/8". At first this looks like a typical alluvial nugget, with bulbous protrusions from a craggy core, but closer examination reveals that the top and bottom were in fact struck with some sort of stamp (cross-in-circle or shield), no doubt related to the circulation of un-minted gold as stopgap coinage known as "oro corriente," certainly rare and important in any case.

Estimate: $400-600