This is a vintage 4-Leaf Clover Keychain Puzzle from the 1950's. Says "GOOD LUCK" in large letters and in small letters, "made in USA" and "PAT PEND".
In excellent condition except for some bleeding of the orange plastic into neighboring pieces typical of the orange plastic used at this time. Normally this horseshoe was marketed with a horse head in the center, but this is a much rarer version with a clover leaf instead.