This is 24-hour clock dial-plate.
The diameter of the hole in the center is 10mm.
The "12Jishin", was used in China and Japan pre-modern, it is a time method that divides the time zone of 12 every two hours a day.
It was known by the name of animals of 12 types of this "Eto" time zone.
The movement and hands of the clock are not included in the product.