Pacific Steam Navigation Co.

The Pacific Steam Navigation Company (P.S.N.C.) was a shipping line that operated on the Pacific coast of South America from 1840 to 1910. It issued two engraved stamps but apparently never used them: MacKay notes they were used with oval cancels, but Ringstöm and Keller dispute this; only suspect items on piece exist.
 * ⅓ oz. / 1 real dark blue on bluish paper
 * 1 oz. / 2 real reddish brown on bluish paper

The printing plates and existing stamps were purchased by Peru in 1857 to be used provisionally for mail between Callao, Chorillos and Lima. These were only in use from 1 December 1857 to 28 February 1858. Peru deemed the experiment successful and issued their own postage stamps, with the P.S.N.C. stamp destroyed.

Reprints were made in the 1860s. These are (of course) engraved, in various colors generally on laid or wove white paper. The ones that are red or blue are in different shades from the originals. A handful of reprints were made on blued paper but these had the colors reversed on each value(!) Typographed or lithographed forgeries are more common with at least 13 different types known.  File:PSNC half oz proof.jpg|1 real reprint in red File:PSNC 1rl forgery.jpg|1 real forgery in the wrong color, a Spiro Brothers creation 

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