1858 10c and 15c, margins all around, tied on piece by Cordoba Franco canc., v.f.
1862 5c rose, v.f. with margins all around, used on cover to Buenos Aires
1864 5c rose red, narrow "C" in "Centavos", large margins all around, tied by blue dotted oval cancel on small FL to Rosario, with matching "Correos de Santa Fe 23 Mar 64" cds, v.f.
1891 1p, 5p and 10p Telegraph stamps used for postage, three diff. overprinted "Muestra" in red or black, last one without gum, others l.h., fine-v.f.
1946 Roosevelt Memorial Issue, imperf. trial color proofs, three top sheet margin panes of 20 (60 stamps) in various colors (gray black, red brown and green), printed on yellow "Muestra" paper, few copies damaged, mostly fine-v.f., rare