My god, the keys: the keycaps are __double-shot__, have scissor switches, and 3-key rollover.
They have the same on cheaper (but still "Special"/"Premium") non-lacquer S100 version: https://www.casio.com/jp/basic-calculators/product.S100/
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They have the same on cheaper (but still "Special"/"Premium") non-lacquer S100 version: https://www.casio.com/jp/basic-calculators/product.S100/