Badge of the 5th Borderland Heavy Machine Gun Battalion, a unit that was part of the 5th Borderland Infantry Division, General Anders' 2nd Polish Corps.
The badge is two-part, in the shape of the Monte Cassino cross with a wreath of laurel leaves superimposed on the cross. In the wreath three rifle cartridges banded with a sash with the initials CKM, below it the number 5.
On the right shoulder of the cross the badge number 401.
The cap unsigned but in PSZ type.