Threadback drum button ANTIQUE, VICTORIAN. A "drum" is a collector's term for a straight sided metal button having a decorative center of various materials. They were made 1840's to 1870..you are buying 1 button..this one is a THREADBACK and has a mirror like center which is darkened and if you hold it up you can see yourself in it. It is 1 in. and the side is 5/16 high..NICE BUTTON & in good condition.