Watch List notes:

(x) El Banco de Espana, a printers uniface obverse and reverse proof/specimen on card for a 500 pesetas, Madrid, 1 January 1884, red serial number 00000, black and pale brown, Juan Alvarez Mendizabal at right, maiden (Justitia) at left with sword and scales, cherub at centre with cornsheaf and wreath, value at centre and at top right, signatures of Camacho and Farina, also a uniface reverse proof on card for the 500 pesetas, brown, the arms of the House of Bourbon at centre, value at left and right(Pick 27, Ed.B69m, Los Billetes del Banco de Espana 1979, 170/171), in PMG holders 63 Uncirculated, an American Banknote Company engraving and possibly the only example extant.

Estimate: £10000 - £15000