Spain. Bank of Spain. 1906-1915 Issues. Date: 23-05-1915. Dimensions: 162 x 116 mm. Material: paper. Watermark: no. Printer: Banco de España. 720,000 notes but unissued. No security thread. Front printing in black and back in orange or blue monochrome. Texts in Spanish. Description of the front: orange security background with the coats of arms of the provinces of Castile, Aragon, León and Navarre. Small floral frame with the value "1000" repeated in the corners. In the center, from top to bottom, the issuing institute "EL BANCO DE ESPAÑA", the words "Pagará al portador", the value in letters "MIL PESETAS". No numbering. A single combination of signatures with El Interventor (The Comptroller) and El Cajero (The Cashier). On the left, a medallion decorated with four cherubs contains a portrait of King Alfonso XIII and Queen Victoria Eugénia. Description of the back: small floral frame with the value "1000" repeated in the upper corners. In the center, a view of the headquarters of the Bank of Spain in Madrid surrounded by a wreath of flowers and the coat of arms of Spain. On the left, a young woman holds out a sheaf of wheat while holding a sickle in her other hand (allegory of Agriculture). On the right, a young Mercury holds out a purse of money while holding his caduceus with another hand (allegory of Commerce). A proof is known with the back in blue or orange without overprint, without perforation, without the cashier's signature and without numbering. No specimen known or encountered for the Type. Not issued, very rare. This proof is part of attempts to make banknotes in the Bank of Spain's own workshops, initiated during the visit of the kings to the building. These proofs, carried out in a hurry, have no watermark or numbering and were not allowed to circulate. Only one other specimen of different color is known in the collection of the Bank of Spain.