My first guess is: maybe a gift by the Netherlands Merchant Fleet for the christening of HRH Princess Margriet in 1943?
Godparents of HRH Princess Margriet Francisca of the Netherlands: The President of the United States of America (Franklin D. Roosevelt) HM Queen Mary (mother of King George VI) HRH The Crown Princess of Norway (Princess Märtha) Jonkvrouw Martine Röell née Del Court van Krimpen (Hofdame and a close friend to Princess Juliana) The Netherlands Merchant Fleet
Up to date Princess Margriet still is the Lady Patroness of the Netherlands Merchant Fleet (and often performs duties linked to the fleet).