For your consideration is this interesting circa 1920s pin. This is a thick, sturdy and well made piece with a nice Art Deco geometric look. It is signed K & B Sterling. I found two makers in my books that use a K & B mark but not this specific mark. This has the old flip up clasp that was used around 1920.
The pin measures 1 and 3/8 inches by just shy of 1 and 1/2 inch.
Nice functioning condition with an uneven patina. Notice how the pin back is applied. Not sure if this means jeweler repair or how it was applied but it is an earlier clasp.