This is a commemorative medal for the completion of the double-tracking and electrification of the Shinetsu Main Line between Naoetsu and Miya-uchi by Japanese National Railways in 1973 (Showa 48). It was issued as a commemorative item by the Shinanogawa Construction Bureau. It has been stored at home for over 30 years. There are scratches, stains, and dullness due to aging. Please check the photos. [Material] Metal (details unknown) [Size] Diameter: Approximately 6cm (please allow for some error) [Color] Silver系 (Silver-toned) [Condition] Some scratches and stains. Please check the photos for details. [Other] Stored at home. Thank you.