6 cuartos black, type II, position 24, used on cover from Tolosa to Madrid cancelled on January 1, 1851 when the stamp had already been demonetised. The cover addressed to a Member of Parliament, was nevertheless taxed 1 real as Postage Due. Rare and most unusual, the SOLE EXAMPLE RECORDED. Cert. Graus 6 cuartos black, type II, position...
6 cuartos black, type I, positions 8 and 11 with type II position 14, used on cover from Sevilla to Motril endorsed 'Muestras sin valor' and thus at a special rate of 18 cuartos for up to 3 ounces (from October 24th 1849 carried at 6cu. per ounce). The highest rated 'Muestras' (Sample Mail) cover known with the 6 cuartos first issue and an extremely rare... 6 cuartos black, type I, positions 8...
6 cuartos black, type II, position 25 used with 12 cuartos lilac on cover from Sevilla to Madrid tied by spider handstamps and Sevilla datstamp adjacent. A beautiful and extremely rare mixed franking, just five covers recorded. Cert. Comex 6 cuartos black, type II, position 25...
The most famous cover from Gibraltar 6 cuartos black, tied by spider handstamp in black to cover endorsed 'Estafeta' from Gibraltar to Cadiz with S. Roque eds below (July 4) in red. The sole recorded usage of the first issue mailed from Gibraltar, and the sole usage known mailed from a foreign country. Unique. Cert. Grau The most famous cover from Gibraltar...