Here is what A.I. had to say about it..
This is an antique/vintage metal (brass- or bronze-toned) keystone-shaped badge or lapel pin featuring the Pennsylvania state coat of arms/seal, with the U.S. motto “E Pluribus Unum” at the bottom.
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Pennsylvania is known as the Keystone State, and the distinctive keystone (wedge/capstone) shape has long been used as a de facto state emblem on official items, military insignia (including Pennsylvania National Guard/28th Infantry Division “Keystone” or “Bloody Bucket” patches and related badges), police/fire badges, markers, and various civic or patriotic pins.
en.wikipedia.org
Key design elements visible (despite corrosion and patina):
- Central keystone containing the Pennsylvania coat of arms elements (shield with traditional symbols such as a ship, plow, and sheaves of wheat; supported by horses; crested by an eagle).
- Crossed poles/rifles or similar behind the keystone.
- Side extensions (appearing book- or flag-like with horizontal lines and ornate ends).
- A smaller top element (banner, pavilion, or secondary shield).
- Bottom scroll or ribbon reading “E PLURIBUS UNUM” (“Out of many, one”).
This matches listings of nearly identical antique/vintage “Pennsylvania State Seal Keystone Badge Pin” items described with the same combination of keystone shape, state seal symbols (horses, eagle, shield, flags), metal construction, size (roughly 1½″ tall × 2″ wide), age-related oxidation/patina, and the “E Pluribus Unum” motto.
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Sellers typically note it as a collectible from an estate, with uncertain exact age/history but consistent with late-19th to early-20th-century patriotic, militaria, or organizational use (Pennsylvania State Police and other agencies have used keystone + seal designs; similar forms appear in National Guard, Home Defense, railroad, fire, or fraternal contexts).It is not a modern reproduction of a standard current military DUI or shoulder sleeve insignia (those usually lack this exact extended form and the national motto in place of Pennsylvania’s “Virtue, Liberty and Independence”). The heavy corrosion and style point to an older original piece rather than a recent replica.If you have clearer close-ups of the reverse (for maker marks, attachment style, or numbers), the center details, or any provenance, that could narrow the specific organization or exact period further.