Hong Kong 50 cents open ring (Silver coloured)

British Hong Kong is a remarkable period of Hong Kong, form 1841-97. The year of the coin will be shown on the surface of the ring. Years of silver coloured 50 cents are limited from 1951 to 1975, please message before ordering for the availability for the year as well as the size. ****** The coin is hand-cut by piercing saw with precision craftsmanship, not those factory made mass production can be compared. And some human marks are remained on the ring and consider as a signature, varies from different artist.