Vintage Boxed Baby World's "KANT-SPILL" Trainer Cup

With a weighted wobbly bottom so it can't be tipped over these trainer cups teach babies that they can hit cups of liquid to make them spin around in a very amusing fashion. Imagine their horror when they are given a non trainer cup and find it just falls to the floor and breaks.
Anyway, in this lovely vintage box comes a wobbly bottom trainer cup and a lid, but these ones don't have the non spill top which were always a useful way of getting healthy doses of plastic into their young bodies when they used them for sharpening their new teeth..
These were Made in Germany.
All the boxes I have left are a bit grubby or damaged.