I purchased this on Mercari. I'm selling it because I don't have a chance to use it. Size: Approximately 21mm * 23mm Please note that there may be slight variations in size due to personal measurement. Please understand that the color may appear slightly different in the photos compared to the actual item due to the shooting environment and lighting in your room. This is a vintage item, so there may be some minor scratches or stains. Please purchase with the understanding of this.