Mexico, (French Post Office) 1866 French Expeditionary Forces, folded letter sheet addressed to captain in Mexico City, with "30" rate and "Corps Exp. Mexique, Bau A, 20 Sept, 66" cds on front and reverse, additional "Bau C, 22 Sep, 66" receiving backstamp, Very Fine. Estimate  $200 - 300. $0 (Image)