This 1930 QSL card is a unique piece of history. It features a stamp imprint postcard with the call sign YS-1FM belonging to J. Federico Mejia. The card was manufactured in El Salvador and has been well-preserved over the years. The receiving operator was W2AFM who went on to become a World War 2 US Navy Submarine Radio Tech 1st Class.  It is a great addition to any collection, especially for those interested in radio history. The card provides a glimpse into the past. This item is perfect for collectors of QSL cards, radios, and other unique memorabilia.