WW2 Polish Special Badge of 10th Battalion, 4th Wołyń Infantry Brigade

Special badge worn on berets and collars by soldiers of the 10th Battalion, 4th Wołyń Infantry Brigade, 2nd Polish Corps under General Anders.
The badge is in the form of a bayonet piercing a flower, with the number 10 below. The reverse features a visible die stamp and a threaded post. Spinner nut is missing. Condition as shown in the pictures.