World War One Polish cap badge, in the form of an eagle in a crown with spread wings and claws.
On the reverse clearly visible struck die, in the middle a fixing pin.
This production of this eagle is attributed to Kraków circa 1917. Worn as patriotic jewelry and by Polish soldiers on headdress.
In the book by Tomasz Zawistowski "Polskie Orły do czapek w latach 1900-1917" a similar eagle appears on page 307 (il.513).