A LEERDAM UNICA VASE, designed by A.D. Copier, globular shape with short cylindrical neck and on applied circular foot, amethyst coloured glass with iridescent finish, engraved Leerdam Unica A.D. Copier, 19.8 cm high; and A LEERDAM UNICA BOWL, designed by A.D. Copier, rounded triangular shape on applied circular foot, the clear glass with acid-treated surface and stained with amber, with partly iridescent finish (minor rim chip), engraved Leerdam Unica A.D. Copier and yearletter for 1930/31