This is a limited-edition commemorative can badge distributed to participants who completed the stamp rally at the 50th-anniversary event of the Hani Dam. As shown in the last photo for reference, there are a total of 6 types, and this is a complete set of all 6 types, all brand new and unopened. My family somehow managed to complete the set, but we've decided to sell it because we're having trouble finding a place to store it. I have stored it carefully, but please understand that it is stored by a private individual.