That one was included in a multigame box, along with "le jeu de l'oie" el "le jeu des petits chevaux" (the game of goose and ludo). I am not able to date the game (not even looking at the game of goose's pics). It might even be pre-war.

There is another version of this game, in a similar box, somewhat bigger though. It is not multicoloured, but the board is made of  green felt.

 

 

Of course, the rules are simple:

The original wooden riders, on the left, and some handmade rubber riders by Ludo Nauws (nice job!):

 

 

(The pictures of the coloured board and riders were sent by Geert Lagrou, who had the game before I did. Ludo sent the pic of his riders.)