This is a headmark sticker set for the Izu Kyuko Resort 21, which celebrated its 40th anniversary in the summer of 2025. The set includes four types: [40th Anniversary], [Sea Resort Odoriko], [Resort Liner 21], and [20th Anniversary of the Den-en-toshi Line Opening]. The package is approximately 8cm square, and the headmark stickers are trapezoidal, with the long side being about 6cm and the short side about 3.5cm. The outer bag is unopened. Izu Kyu Ito Line Tokaido Line Resort 21 Tokyu Series 2100