COUNTERFEIT MONEY. Jacques-Jean BARRE (1793-1855, general engraver of coins at the Monnaie de Paris from 1842 to 1855; he was the designer and engraver of the first two series of postage stamps of France). Set of 27 manuscript pieces, partly autograph, Paris, Birmingham and London 1845; about 50 pages in-4 or in-fol. Interesting file on the manufacture of French counterfeit coins in England. Barre is sent to England to conduct an investigation. The file is mainly composed of drafts of letters from Jacques-Jean Barre, but also of letters received during his mission, translations and a 5-page folio report on the investigation conducted in England about this counterfeiting. There is also an interesting letter on "some modifications to the impressions of the punches and horns [...] to prevent the counterfeiting and to make useless, in the hands of the forgers, the imitated punches" (3 p. in-4). Plus the drawing of a press.