Le Colonel Comte Michel Tyszkiewicz.

With only 500 numbered originals published in 1904, Joseph Tyszkiewicz's Histoire du 17me Régt de Cavalerie Polonaise 1812-1815 is an invaluable history of a little-known Lithuanian regiment that was formed during the invasion of Russia in 1812 and followed Napoleon's Grande Armée through Germany until 1814 when it surrendered with a besieged Marshal Davout at Hambourg.  Tyszkiewicz, whose great-grandfather (Comte Michel Tyszkiewicz) was the regiment's colonel, conducted extensive research in many private and state archives in Poland, Russia, and France.   Numerous documents, many believed destroyed after two world wars, are quoted at length.

Two originals sold in Paris within the last five years for $600 each.