The object shown is a vintage Masonic button stud, also known as a shirt stud or tuxedo stud. It features the iconic Masonic emblem of the square and compasses with the letter "G" in the center. 

* This type of stud is often part of a set of formal wear accessories, which typically includes matching cufflinks. The symbol of the square and compasses are architect's tools used to teach moral and ethical lessons within Freemasonry. The "G" commonly stands for both God(or the Great Architect of the Universe) and Geometry, representing the divine order and harmony of the universe. 

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