Saltpeter

Owner	Nelida Fernandez Besada
Observations	Saltpeter is a mixture of potassium nitrate and sodium nitrate. It is found naturally in large areas of South America, mainly in the Uyuni salt flats in Bolivia and in the northern part of Chile, with thicknesses of up to 3.6 meters.
Country	Chile
Face value	20 cts
Year	1938
State	Used
Status	Exhibition - Non-transferable
Category	Economy
Format	Vertical
Color	azul
Other information	Perforated stamp
visualizations	262