This is a Showa-retro mini playing card set from the 1980s. The package, which says "For Children," is a distinctive feature. It's smaller than standard playing cards. It was likely sold as a travel item or souvenir. It's popular as an antique item and a collector's item. I opened it to check the number of cards for the photos, and all 53 cards, including one JOKER, are present. Please refer to the photos before purchasing, as it has been stored at home for a long time.