Mexico 1875 Porte de Mar Collection. Interesting reference study, neatly mounted on quadrille pages, well annotated in German, with genuine identified accordingly; note the official overprints in violet and red diagonally for these issues from the 2cts to the 100 centavos, with over 30 examples including fancy cancels, deserving much further research; primarily for study purposes and looks very impressive (no photo). Estimate  $200 - 300. $0