This album was released in 1956. Delpher shows an ad and two reviews for this album, all from July and August 1956. Here’s one to check (from “Nieuwe Haarlemsche Courant”, July 14, 1956).
Originally, this album was released on US Columbia CL 646 in 1955. See front cover image below (I can understand why Philips made a new cover for their release…!).