It
I had it at late 1950s at the earliest (although if it had been designed last week I would not have be overly surprised) but, in fact, it was designed in around 1913. The vibrancy of the colours and the outlandish and unpredictable design are not something that I would associated with that time-frame. I am also very fond of the purple option which has a real art-deco feel to it in my opinion:
This goes to show how so many artists are ahead of their time – perhaps that is ultimately how one defines genius …