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it is a genuine unused, with disturbed o.g., block of fourwith plate finisher's initials in the lower right margin and signed Clyde De Binder, Plate Finisher: in the right margin.
it is a genuine unused, o.g., hinged, block of four, with siderographer's initials in the lower left margin, the lower right stamp with a small gum crease.
it is a genuine unused, o.g., never hinged, block of four, with siderographer's initials in the lower left margin, the top right stamp with a light gum bend.