Hold this Napoleon-signed document up to the light and you will see a watermark eagle, the symbol of his imperial dynasty. That is just one of the engaging curiosities of this original Oct. 8, 1814 letter. Why Napoleon signed "NP" twice and one signature was crossed out is a mystery. The letter, from The Comte de Bertrand, asks Napoleon Bonaparte if he could save some francs by buying less precious fabric and leather to upholster the carriage that immediately followed the imperial one. The 8 x 14" correspondence (EX), written in a dainty hand, is signed by Bertrand, and Napoleon approved with his "NP" signature on the left, plus three lines. It is quite unusual to see this much writing by the Great Bonaparte.