National Bank of Switzerland, specimen 500 Francs, ND, serial number 5G 00000, no signatures, red-brown and olive-green on multicoloured underprint, woman looking in mirror at right, value at centre left, reverse allegorical scene, "The Fountain of Youth", (Pick 51s, TBB B335s), overprinted SPECIMEN in red with two red De La Rue specimen oval seals in field, about uncirculated and scarce