When you consider the world’s most iconic and ubiquitous products, objects like the iPhone, Biro ballpoint pen, or Toyota Corolla probably come to mind. But there’s little debate in my mind that among such excellent company, the design of the Casio F91W-1 stacks up to these; with the sales of hundreds of millions of units cementing their status as one of humanity’s most recognisable inventions.
There are good reasons why Casio watches are so popular: they’re widely available,…

