Antique Sections of a Sphere Wooden Blocks Set in Finger Jointed Slide Top Box art glass with "Masereel" handwritten in black

with "Masereel" handwritten in black marker

(In this scenario

Solid brass (I believe brass rather than bronze)

There is a bit of hairline cracking on two adjacent sides

Antique Sections of a Sphere Wooden Blocks Set in Finger Jointed Slide Top Box art glass with "Masereel" handwritten in blackI recently found a couple of c. 1900 Milton Bradley Kindergarten Blocks sets designed by Friedrich Froebel, which the box and the blocks on this set remind me very much of. I have not been able to find another set like this one out there, which I assume were made to teach the concept of fractions, with five slots in the box corresponding to five sets of blocks, dividing a sphere into 2 then 3, 4, 5 and 6 sections. I can't say for sure that these were