The MP-4 was one of many Eastern European clones of the M17 mask and was issued to the Polish People's Army. It was replaced in service by the MP-5.
 
The mask was nicknamed the "Bulldog" due to its appearance.
Cheek filters either side of the mask
6 point elasticated head strap
Size 1
Grade 1 mask, head straps intact however the elastic is over stretched (does not come with haversack)