Lot 51058 – 1902 3c, 5c and 6c, plus 1944 4c, in strips of four, overprinted “SPECIMEN” and Spanish “Spécimen”

1902 3c. green and carmine/yellow, 5c. dull purple and black on buff and 6c. purple and carmine on red in strips of four, overprinted “Specimen”, with additional Spécimen (Spanish) diagonal receiving handstamps, also 1944 4c. purple and carmine/yellow, (distributed in unused condition by the UPU) in a vertical strip of four with the same Spanish overprint, some faults and soiling though a very rare group with the additional handstamps possibly applied in Bolivia.