I believe this to be an Antique Knights of the Golden Eagle stick pin without ribbon and a unique piece of historical memorabilia. Stamped on August 24, 1866, it represents a piece of fraternal organization history dating back to the 19th century. The intricate design and craftsmanship suggest that it was a valued and cherished item for members of the Knights of the Golden Eagle. This rare collectible is a must-have for collectors and enthusiasts of historical fraternal organizations.