1891 Mexico Lg Numeral Covers

5677- 1887, MAZATLAN, SINALOA TO SAN IGNACIO

5663- 1887, MONCLOVA TO OHIO, US, WITH BACK STAMP

5656- 1889, REGISTERED LETTER FROM TOLIMAN TO MEXICO, WITH GREEN CANCELS, A VERY RARE POSTMARK, WITH A 10¢ AND 25¢ STAMP, FRONT

5654- 1890, REGISTERED FROM TOLUCA TO MEXICO, 20¢ RED AND 25¢ VIOLET-FRONT, UNUSUAL

5668- 1894, PROGRESO DE PALIZADA, CAMPECHE, WITH FANCY AND SCARCE CANCEL, TO NEW YORK