These are milk bottle caps collected approximately 30 to 35 years ago. They were stored in a file used for stamps, but there is some aging due to amateur storage. Please be sure to check the images. Also, please refrain from purchasing if you are concerned. We will respond to any questions or consultations regarding the product in the comments. For bulk purchases of milk bottle caps, we will offer a discount on the postage fee, so please consult in the comments. Thank you. #YukijirushiDairy #OsakaCity #MiyakojimaWard #MilkBottleCaps #ShowaRetro