CASIO F-91WB-8A Simple Minimalist Mono Tone Face Classic Digital Watch

This watch has been sold more than 100million pcs since 1989, and still manufactured 3 million pcs per year.
Considering such a spread and popularity, you can say that this modest masterpiece might already become an "Infrastructure of Mankind".

This is a modern interpretation of F-91 with simplified mono tone minimalist face by omitting trim lines and letterings such as "water resist" and "alarm chronograph".
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