GJ.1a + 1, 5c. light blue, horizontal pair (positions 17 and 18), the left stamp with variety "period after CEN", mint without gum, very nice, signed by Victor Kneitschel on back.
GJ.1, 5c. blue, type 4 (with top sheet margin), it can be recognized for example for the small dot attached to the "B" of CORDOBA at top right, hinged, thin on back, superb front
GJ.1, 5c. blue, type 30 (last one on the plate), it can be recognized by the inner line of the outer oval broken between "C" and "O" of CORDOBA, hinged, small thins on back, superb front