Spain. Bank of Spain. 1878-1880 Issues. Date: 01.01.1878. Dimensions: 169 x 93 mm. Material: paper. Watermark: BANCO DE ESPAÑA / 50. No security thread. 500,000 issued notes. Printer: Banco de España. Front printing in black and brown and back in yellow. Texts in Spanish. Description of the front: frame composed of the value “50” continuously. On the right, profile portrait of the Spanish poet and dramatist Pedro Calderón de la Barca (1600-1681). On the left from top to bottom, the numbering in black repeated twice, the issuing institute "EL BANCO DE ESPAÑA", "Pagará al portador (will pay to the bearer)", the value in letters "CINCUENTA PESETAS", then three signatures in black. A single combination of signatures with El Gobernador (The Governor), El Interventor (The Comptroller) and El Cajero (The Cashier). Counterfoils left and right with "BANCO DE ESPAÑA" in vertical. Back description: yellow safety frame and background made up of small guilloche patterns. In the center, two medallions, each containing a portrait of a woman in profile. No specimen known for the Type.