Antique 9ct gold mother of pearl buttons button set Calcutta Cooke & Kelvey

A lovely set of antique buttons in the original antique fitted leather box lined with midnight blue velvet and silk to the top with lettering in black writing for Cooke & Kelvey Diamond Merchants Calcutta. The push button fastening on the box works well, snaps shut with the hinges in fine order. Stamped to the reverse for 9ct gold. All in very good original condition.  Buttons measuring 13 cm in diameter each approx