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.
For detailed reference...
Browse with Firefox or Chrome.