This is a set of 4 dam cards: Kuroda Dam in Aichi Prefecture, and Tokuyama Dam, Maruyama Dam, and Shin-Maruyama Dam in Gifu Prefecture. The Kuroda Dam card is dated 2017.07, and is a recently updated, latest version card with few available. After obtaining them, I immediately put them in sleeves and stored them carefully. I will reinforce them and take water damage precautions, and ship them carefully via standard mail or mini-letter. Thank you.