Box cover image via Hake's.
This Snow White "Bagatelle" pinball game was manufactured in the UK by Chad Valley circa 1938. The game itself sits in the base of the box and is made of tinplate. It comes with 5 colored balls--3 green and 2 blue. A book or other object would be placed under the top end so that the board would slope downward towards the plunger.
A simple game for younger children, the winner would be the one who scored the highest points by propelling the balls into the numbered metal cups.