This limited edition model commemorates the 50th anniversary of Casio watches and expresses the universal yet ever-changing "sky and sea". With functions that fit the times and lifestyles and a special CMF design (color, material, and finish), this special model symbolizes the watch's history and future challenges. The bezel is made of scratch-resistant, highly transparent sapphire glass, and the vapor deposition process expresses a vivid blue worldview. The titanium outer frame is coated with DLC. The back cover and crown are also decorated with sapphire glass to create a special feel. The dial ring pays homage to Casio's first watch, the Casiotron, which was born in 1974. Gold accent colors are used throughout. The dial is mold-transferred with a titanium recrystallization pattern and has a gradation vapor deposition that changes from dark blue to turquoise blue.