MMA Earring & Brooch/Pendant TBM Set 14k Gold Plated Clamshell Clip On

MMA TBM marked clip on earring and brooch (also can be worn as a pendant)... Museum of Metropolitan Art Jewelry, not sure what TBM is, but I have read The British Museum or The Brooklyn Museum... so I'm not sure... regardless, the set is beautiful and has a lovely patina. The set is 14k gold plated, has a solid heavy weight and in good vintage condition. The shell measures about 2.2 inches wide and 1.65 inches high. The earrings are about 1 inch long x .75 inches wide. Shipping is next business day Monday - Friday