Set of vintage wooden geometric shapes

This set of 13 geometric shapes were used in schools to teach mathematics and geometry.
The set is made in Belgium, probably made by H. van Havermaet, Bruxelles.
Circa 1930

4 items 30 cm, 3 items 28 cm, 1 item 25 cm, 2 items 20 cm, 2 x sphere 10 cm, 1 x cube 10 cm.

There is patina on the all items.