## Product Name **Working SEIKO 5931-5440 Quartz Watch Square Case 1981 Vintage Men's Women's Unisex New Band** ## Product Description This is a vintage **SEIKO 5931-5440** wristwatch. Manufactured in **1981**, this classic vintage model features a distinctive **square-shaped case**. The unisex design makes it suitable for both men and women, and it pairs especially well with vintage styles and retro fashion. The band has been replaced with a **brand-new replacement band**, allowing you to enjoy the watch comfortably. ## Brand SEIKO ## Model Number 5931-5440 ## Item * Wristwatch * Men's * Women's * Unisex * Vintage Watch ## Movement Quartz ## Year of Manufacture 1981 ## Case Shape Square ## Size * Case Diameter: Approx. 30.5 mm * Wrist Circumference: Adjustable up to approx. 19 cm *Please note that measurements may have slight variations.* ## Weight Approx. 33.6 g ## Band **Brand-New Replacement Band** ## Battery **New battery replaced on August 24, 2026** ## Accessories None *Everything included is shown in the photos.* ## Condition **Vintage Condition** The watch is currently working. The band has been replaced with a brand-new replacement band. There is some minor dirt or discoloration **inside the dial**. Please refer to **Photo 10** for details. As this is a vintage item, there are also minor scratches, scuffs, and signs of wear due to age. *Please purchase only after understanding and accepting the dirt/discoloration inside the dial.* *Please carefully check the photos for the overall condition.* *The battery was replaced at the time of listing.* *As this is a vintage watch, we cannot guarantee its accuracy, daily time deviation, internal mechanism condition, or long-term operation.* *Please purchase only if you understand and accept the nature of used and vintage items.* ## Purchase Source * Brand Reuse Store * Store affiliated with the Association Against Counterfeit Product Distribution (AACD), Japan * Pawnshop / Secondhand Dealer Market / Store Item This item has been professionally authenticated and is a genuine product, so you can purchase with confidence.