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On Light Cream Paper Size: 160mm x 240mm |
  
1c Juan Antonio Alvarez de Arenales Color Proofs on Thin Paper in Green, Orange and Carmine Issued Color 
Die Proof in Blue With Two Impressions |
1888, OCTOBER 31: BUENOS AIRES to MONTEVIDEO, URUGUAY Taxed 2c upon arrival. |
4c Julian Segundo de Aguero Black Die Proof on Black Background    
Color Proofs in Carmine, Green, Orange and Blue Issued Color |
Composite Die Proof in Red With Two Impressions of 1c and 4c Designs The 20c, 30c, 80c and 120c Unadopted Oval Designs Probably Intended for Telegraphic Use |
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