Rare Vintage Seiko Ruputer Pro Men’s Digital Computer Smart Watch JDM 1990s

Up for sale is a rare vintage Seiko Ruputer Pro men’s digital computer smartwatch, a groundbreaking Japan Domestic Market (JDM) release from the late 1990s and widely recognized as the world’s first smartwatch. Long before the Apple Watch or modern Wear OS devices existed, Seiko introduced the Ruputer as a fully programmable, wrist-worn computer, making this an important and highly collectible piece of tech and horological history. This example is fully working, and all features and functions operate properly as intended. The watch powers on, navigates menus correctly, displays information clearly, and responds as expected. All parts of the watch are original. The Ruputer Pro was released in 1998 and features a 16-bit 3.6 MHz processor, 2 MB of non-volatile storage, 128 KB of RAM, and a 102×64 pixel monochrome LCD. It includes an 8-direction joystick, six function buttons, a serial interface, and an infrared (IR) port for device communication. Seiko also bundled the watch with a software development kit, allowing programs to be written in C, making it one of the earliest truly programmable smartwatches. The main body measures approximately 2 inches wide, 1 1/8 inches tall, and 5/8 inch thick. Power is supplied by two CR2025 lithium button cell batteries, providing roughly 30 hours of active use, with an automatic standby mode when idle to help conserve battery life. The watch is in fantastic physical condition, showing only minor signs of use and age. The photos best describe its physical condition and should be reviewed carefully. Key Details: • Brand: Seiko • Model: Ruputer Pro • Type: Digital Computer Smart Watch • Era: Late 1990s • Origin: Japan Domestic Market (JDM) • Processor: 16-bit, 3.6 MHz • Storage: 2 MB non-volatile memory • RAM: 128 KB • Display: 102×64 monochrome LCD • Power: Dual CR2025 lithium batteries • Functions: Fully working, all features operational This is an exceptionally rare and historically important Seiko wearable, ideal for collectors of vintage digital watches, early smart technology, or Japanese-market electronics. Ships carefully. Feel free to message me with any questions.