The item shown is a United States Marine Corps (USMC) Eagle, Globe, and Anchor (EGA) insignia pin, featuring a two-toned silver/dark metal eagle and anchor overlaying a golden-toned disc backing.

This style of two-piece or split-tone emblem has historical precedents used for dress uniforms, service caps, or collar insignia across various mid-20th-century eras. 

The design incorporates the traditional eagle for the nation, the globe for worldwide service, and the anchor for maritime heritage.

The market value of a vintage United States Marine Corps Eagle, Globe, and Anchor (EGA) insignia pin generally ranges between $15 and $140, heavily depending on its specific era, metal composition, and whether it is a single item or a matching pair