The 1872 Design by Virey Freres at Paris, Engraving by E. Schilling Berlin, Typography by Joh. Enschede and Sons, Harlem, for the Curacao 1873 Issue. Berlin color proofs on smooth white paper (slightly toned), imperforate without gum. These examples are in Green and have been hinged previously with some hinge remnants. 25C has horizontal crease. Rare and hard to find in any collection of Curacao. Reference: Van Dieten "Proeven Catalogus 1988". Very worthwhile for exhibiting.