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Japanese tennis player Kei Nishikori was seen wearing a Casio Casioak Jellyfish watch. He wore this whilst playing tennis for Japan at the 2020 Tokyo Olympic games. This was a limited edition and in total, only 200 pieces were released. The Jellyfish is based on a modified G-Shock design.
This is a beautiful watch that has a black dial, multicolored hands, and a see-through case and strap. Good luck finding one though if you’re interested, due to the limited availability this watch is difficult to get hold of.