La Compañía Explotadora de Minas
We know of a series of four vales printed by American Book & Printing Company (5c, 10c, 20c and 50c). However, the fact that three of the known examples are numbered 0007 and the fourth 0003 suggests that these came from presentation sets and so it is possible that these notes were never put into circulation.
The notes carry the facsimile signature of José María Fernández(?) as Director Gerente.