Your search for "金色のガッシュ!!　あみあみ　〜8月19日" revealed the following:

©MAKOTO RAIKUThis is a 57mm pin badge.*This product is sold in boxes (6-packs).* One box contains the complete set.■Product Dimensions (Package): H80 × W80 × D80 mm■Product Dimensions (Item): 57 mm■Materials: Metal, Paper/Film ■Distributor: A3

© Ryoko Kuji and KADOKAWA / "Dungeon Meal" Production CommitteeIntroducing the Chibitoko 3-Way Pin Badge from the TV anime “Dungeon Meal.” Izutsumi has created a brand-new illustration of the Chibi character walking, which has been turned into this 3-way pin...