Cap

http://lod.ehri-project-test.eu/units/us-005578-irn688869-irn694181 an entity of type: RecordSet

The cap was donated to the United States Holocaust Memorial Museum in 2019 by Peter Koper, son of Antoni Stefan and Sophie Koper. 
irn694181 
Cap 
overall: Height: 2.500 inches (6.35 cm) | Width: 9.750 inches (24.765 cm) | Depth: 8.750 inches (22.225 cm) 
Cap from the Polish First Armored Division 
No restrictions on access 
No restrictions on use 
Green wool cap with a flat circular crown and leather band across the front 

data from the linked data cloud