Celebrate the 50th anniversary of Casio watches with the limited edition all-new Casiotron, a re-creation of the first-ever Casio wristwatch. With its debut in 1974, the Casiotron was the world’s first digital watch with an automatic calendar that automatically adjusted for longer and shorter months. The all-new TRN-50 pays homage to the groundbreaking original while integrating today’s cutting-edge technology. With a meticulous reproduction of the original design, both in look and size, the external diameter is essentially the same, at 39.1mm, and the profile measures 0.3mm slimmer.