Lot
2082 
Mexico, 1865 French Expeditionary Forces, French military engineer officer cover from Mazatlan to Strasbourg, France, endorsed "De Mazatlan" at top, franked with France 1862, 10c bister + 20c blue, two singles tied by "CEM K" (Mazatlan) lozenge cancels, boxed "PD" handstamp (fully paid officer rate) reverse with Paris transit and Strasbourg receiver, believe to be the only known Bureau K cover and the only cover from Mazatlan using the French military mail system, illustrated in Pietsch Imperial Eagles of Mexico 1864-66 (page 205). Estimate $600 - 800.
The French operated their own postal system in Mexico, parallel to the public one that also operated.
Realized: $900