This is the Casio masterpiece diver's watch, the "Kajiki Diver" MD-723. It's a rare vintage model with the marlin mark engraved on the back cover, and it's a hard-to-find collector's item nowadays. ・Model Number: MD-723 ・Back Cover Engraving: Marlin 341929 ・Working (as of the time of listing in 2025) ・Belt: Genuine-style urethane (missing the loop) ・There are minor scratches on the case and crystal, but it's in good condition considering its age. ・Luminous paint and rotating bezel operation confirmed. ※This is a vintage item and will be sold as is. ※For those who appreciate its value and for collectors.