One of two examples of the "Cammann" imprint on the Confederate 10c carmine stamp on cover has topped Robert A Siegel Auction Galleries' sale of United States Postal History, held on May 23 in New York.
 Research has suggested that Cammann was a lithographic worker |
It made $18,500, achieving a 146.6% increase on the $7,500 high estimate.
The stamp is known as the "Cammann" imprint due to the word being printed in the selvedge, with research suggesting that Cammann was a lithographic worker. Five examples of this rare addition are known on the 10c stamps, though only two are found on covers, leading Siegel to describe it as "one of the most outstanding of all general issue covers".
Paul Fraser Collectibles specialises in selling the finest stamps from around the world.
