Guatemalan quetzal 5, 10, 20 and 100 quetzales, with quetzal notes added in 1933. In 1946, the Bank of Guatemala took over the issuance of paper money, with its first issues being overprints on notes of the Central Bank. Except for the introduction of 50 quetzales notes in 1967, the denominations of banknotes were unchanged until and 1 quetzal coins replaced notes at the end of the 1990s. In the top-right corner of the obverse face of each banknote, the value is displayed in Mayan numerals, representing Guatemala's cultural history. The Bank of Guatemala has introduced a polymer banknote of 1 quetzal
Resplendent quetzal iridescence from green-gold to blue-violet) and red breast. Depending on the light, quetzal feathers can shine in a variant of colors: green, cobalt, lime, yellow, to ultramarine. Their green upper tail coverts hide their tails and in breeding males are particularly splendid, being longer than the rest of the body. Though quetzal plumages appear green, they are actually brown due to the melanin pigment. The primary wing coverts are also unusually long and give a fringed appearance. The male has a helmet-like crest. The bill, which is partly covered by green filamentous feathers, is yellow in mature males and black