The 1918 2 Centavos in Iron (Ferro) is a legendary and highly valuable coin for collectors of the Portuguese First Republic. While millions of the bronze version were minted, the iron version is rare, with only 170,000 ever produced. Because of its material, this coin is extremely prone to oxidation (rusting). Finding one in high-quality condition is very difficult, which drives its value up significantly compared to the common bronze version Technical Specifications: Composition: Iron (Ferro) Weight: Approximately 4.6g to 4.8g Diameter: 23mm Edge: Smooth/Plain Mintage: 170,000 (Very low compared to the millions of bronze issues)