Antique Masonic Pressed Horn & Sterling Silver Pin

This antique (circa 1870) masonic pin is made from pressed horn, that is in the shape of a Keystone, and inlaid with a sterling silver Square & Compass with letter G. It measures ~ 7/8" in height.

Pressed horn is made from ground animal horn that is heated and pressed into a hot mold to form a shape. It was essentially an early form of thermoplastic and was popularly used during the mid to late 19th century in Victorian jewelry.