Cuba 1914 - Scott J5-7 - (EDIFIL EMISIONES DEFINITIVAS #5-7) for the regularly issued Postage Due (Tasa por cobrar) stamps.
These are Plate/Color Proofs of the 1914 Postage Due stamps. They are horizontal pairs on cardboard of the 1c, 2c and 5c stamps that were eventually issued in red carmine instead of these colors. These plate proofs on cardboard are very, very rare. We think that perhaps (but not sure) only one set of sheets were ever found in the archives of the Security Banknote Company.