Rare Vintage Casio Casiotron R-15 Men’s Digital Sports Watch JDM 1970s

Up for sale is a rare vintage Casio Casiotron R-15 men’s digital sports watch, produced exclusively for the Japan Domestic Market (JDM) during the 1970s. This early digital model represents Casio’s pioneering work at the dawn of electronic timekeeping, featuring a distinctive circular display layout and a clean, futuristic design that helped shape the earliest era of digital watches. The watch is in full working condition, with all functions operating properly, including timekeeping and the day, date, and month displays. All buttons respond as intended. This example is fitted with a genuine Casio stainless steel bracelet. While it is a correct Casio bracelet for the period, I am unsure if it was originally issued with this specific watch. The watch also comes with a vintage Japanese calendar attachment, as shown in the photos. These small add-on calendar plates were originally designed to be worn with the watch to allow quick reference to the date and are a unique and increasingly hard-to-find accessory. The calendar attachment can be easily removed if desired. The watch shows signs of use and age, and the photos best describe its physical condition. Key Details: • Brand: Casio • Model: Casiotron R-15 • Era: 1970s • Market: Japan Domestic Market (JDM) • Movement: Digital Quartz • Functions: Time, Day, Date, Month display • Case Material: Stainless steel • Bracelet: Genuine Casio stainless steel bracelet (unsure if original to the watch) • Accessories: Vintage Japanese calendar attachment (removable) • Condition: Fully functional; signs of use and age; photos best describe condition • Made in Japan A highly collectible early Casio digital timepiece and a true piece of horological history from the 1970s, made even more appealing by the inclusion of a rare period calendar attachment. Ships carefully. Feel free to message me with any questions.