There are a number of "Shamrock" tokens.
These are often described as being "Irish"
Mostly USA plus a few from elsewhere.

I don't have any of these.
Some are listed elsewhere.

 
Shamrock encased
 

encased shamrock/clover

O: GENUINE FOUR-LEAF CLOVER SUTHERLAND LUMBER CO., 19th & WYOMING, K.C., MO. GOOD LUCK
(Kansas City) encased in clear plastic with a metal rim. 25mm.

O: ALL LEATHER IN VITAL PARTS ... LINCOLN STORE ... JOLIET, ILL
R: GENUINE FOUR LEAF CLOVER GOOD LUCK CHARM

O: GENUINE FOUR-LEAF CLOVER | GOOD LUCK CHARM
R: IT'S A LUCKY DAY FOR YOUR CAR | WHEN YOU CHANGE TO = QUAKER STATE MOTOR OIL. MADE IN U.S.A.
Plastic 1 & 1/2" by 1 & 3/4", looped at the top.

O: SCHILLING BEAUTY SHOP ELEANOR BADER COURTEOUSLY SERVING THE PUBLIC FOR 25 YEARS PHONE 35202 532 CLEVELAND AVE. NW
R: GENUINE FOUR LEAF CLOVER GOOD LUCK CHARM

An encased real shamrock in a cardboard mount
Encased with a metal back and cellophane front cover. About 32mm in diameter, it is an advertisement for "Universal Credit Corporation". Still on original card and never used. Made by Bastian Bros. Co., Rochchester, N.Y.

The shamrock is associated with Ireland because of the St. Patrick story and the Holy Trinity. It has long been used on Irish tokens. However, its history might go back much further!

History of the four leaf clover

The four leaf clover is a universally accepted symbol of good luck with its origin ages old. According to legend, Eve carried a four leaf clover from the Garden of Eden. "The clovers also occupied a position in the cultural life of early peoples. White clover (T. repens L.) in particular was held in high esteem by the early Celts of Wales as a charm against evil spirits." Clover Science and Technology". N.L. Taylor, 1985. Druids held the 4 leaf clover in high esteem and considered them a sign of luck. In 1620, Sir John Melton wrote: "If a man walking in the fields finds any four-leaved grass, he shall in a small while after find some good thing. Napoleon, hesitant to believe this folk tale, coming across a four-leaf clover right at the front-feet of his horse, out of curiosity, bent down. At that time a bullet crossing right over him, he survived (believe it or not).
The mystique of the four leaf clover continues today, since finding a real four leaf clover is still a rare occurrence and omen of good luck.

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