Cufflinks with a 4-Leaf Clover inside a Horseshoe Hallmark??

Hello, I have some cufflinks that I believe are silver. They have a hallmark that I’ve never seen and I cannot locate any information on the internet. There is a 4-leaf clover inside of a horseshoe. Any help would be greatly appreciated! Thanks in advance!

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What is the horseshoe over clover hallmark?