Brass Neck Stock (Necktie) Buckle

 

This is a brass neck stock (or necktie) buckle that was used to secure an individuals necktie.  It measures around 0.1″ x 1″ x 2″.  For source and more details, click here.

 

Image from: http://www.cr.nps.gov/museum/exhibits/revwar/guco/gucoappear.html