Rare Dutch Blue & White Royal Delft Hand Painted Ball Vase - 1940

The tin glazed earthenware ball vase decorated in shades of blue with stylized flowers and three rotating cartouches with a mii, brown sailing vessel with a dark background. The bird sitting on a branche without leaves.  Produced during the Second World War.Any influence by the war and occupied Holland by the Germans???  Signed on the bottom in underglaze blue for:
DE PORCELEYNE FLES  -  ROYAL  DELFT 
DELFT - HOLLAND  &  BJ = 1940
Painter’s initials:  JF = J. Fröhlich Jr.
Employment dates: 1932-1977/79.
Literature:
This item is not described in Royal Delft a guide to the Porceleyne Fles by Rick Erickson.Only shown in the decor A models page 263 VIII 138.

Height: 14 cm.  (5,5 inches.)
Diam.:  17 cm.  (6,7 inches.)

Weight: 667 grams