Los 2018
1850, 6 cs. black, plate 2, setting A, horizontal block of 50 stamps, neatly cancelled by spider cancel, fixed to paper; some light creasing and small faults, one of the largest blocks known of this stamp and great rarity, described in H. Griebert in "The Stamps of Spain", certificate Scheller
Provenance: Cafisa Auctions (1980)
