Rare 1859 French Albumen Print from a wet collodion-on-glass negative by Mayer & Pierson active Paris 1850's-1860's of Emperor Napoleon III & his Son, The Prince Imperial; mounted on blind stamped board with embossed credit for the photographers as photographers to his Majesty the Emperor; custom APF gold leaf frame with archival silk mat & bevel. Good condition. Height of albumen 6 1/8 inches (15.5 cm.) X width 4 3/8 inches (11.2 cm.).