Indeed one of these:https://en.numista.com/catalogue/in...y&te=y&cat=y
I found this on internet (or was it here?):
A Chinese Coin with the Powers of a Charm
This is an example of an official Qing (Ch'ing) Dynasty minted coin, meant for general circulation, but which was immediately considered to have the powers of a charm. In the year 1713 AD, to celebrate the 60th birthday of Emperor Sheng Zu (Kang Xi), this special issue kang xi tong bao (#24247;#29081;#36890;#23453;) coin was cast with a bronze of a golden color. A 60th birthday is considered a major event in China. In honor of this milestone, the Chinese character xi (#29081;), which is located below the square hole, was written slightly differently. The character would normally have a vertical line at its left. Also, the part of the character normally written as (#33251;) has the center written as a (#21475;) instead. Finally, the upper left part of the tong (#36890;) character, located to the right of the square hole, has only one dot instead of the usual two.
There are several stories connected with this coin that have been passed down for the last 300 years which have given this coin the power of a charm. The stories have turned out to be historically false but continue to be believed. The different versions of the story basically state that the bronze used in the casting of this coin came from the melting down of gold statues of the eighteen disciples of the Buddha. These disciples were called lohan (luohan #32599;#27721;) in Chinese. Because the metal used to cast the coins was believed to be directly associated with these disciples of Buddha, the coin is believed to have special powers and is usually referred to as the lohan coin or arhat money.
Because of its special charm qualities, these coins were given to children in olden times as lunar New Year money (yasuiqian #21387;#23681;#38065;).
These coins were also considered to represent good luck because they commemorated a reign lasting for sixty years which is a complete cycle of the traditional Chinese calendar and thus symbolic of a long life.
Traditionally, these coins also acted as a keepsake or pledge of love between a man and a woman. Some women would even wear one of these coins tied to their hand in lieu of a "gold" engagement ring.
Up until about the 1940's, there was a tradition in the rural villages of Shanxi Province where stylish young men liked to carry a lohan coin between their teeth. This was an attempt to mimic the tradition of stylish young men in the cities who liked to show off a gold tooth.