Store stock Items deteriorated over time 380→350 The age is unknown, but there's a barcode on the case, so I think it's from the late Showa to early Heisei era. Discontinued product Found in the warehouse. The paper case is quite dirty. The contents are relatively clean, but there is some staining. Thank you for your understanding. ❗️This is a 23-hole item. Replacements are probably not sold anymore. Please understand this before purchasing. Shipping via Yu-Packet Post.