Banque Nationale, colour trial 5-Riels, ND (c.1955), blue and multicoloured, sculpture at left (P.2), colour trial 1-Riel, ND (c.1956), pale blue, boats and ships (P.4), colour trial 20-Riels, ND (c.1956), green, combine harvester at right (P.5), SPECIMEN overprint, perforation, mounting traces at top, extremely fine (3)