This is a metal charm believed to be from the Kofun period. While it's impossible to definitively say whether it's from the Jomon or Yayoi periods, it's highly likely to be an artifact from an ancient era. Discoloration, scratches, and dirt are visible due to aging. Please refer to the photos. 【Material】Metal (material unknown) 【Size】Weight: Approximately 2 grams; Size: Approximately 15 x 20 mm 【Color】Dark gray with a bluish-green tint 【Condition】Some scratches and dirt present. Please check the photos for details. 【Storage】Stored in a dark place. No pets, no smokers. 【Reason for Listing】Downsizing my collection. Thank you. Feel free to ask any questions. I also have many other cute items for sale, so please take a look if you'd like! ＼(^o^)／ ※Please note that I may suddenly end the listing. (/ _ ; )