I want to clarify info on the WW2 Greek helmet.  Info I found states the helmet shells were made in Italy.  The liners were added in Greece.  There is a very small lip going completely around the unrolled edge of the helmet.  This illustration is good.  However the slotted 'screws' shown at lower edge are small round head rivets in normal examples.  Position is correct.  

M36 Greek Helmet

Fighters of the NOVJ (Yugoslav Partisans) during an attack on the building number 167 on the boulevard of king aleksandar in october 1944

Partisans in Beograd 1944

GLT  Muñoz Grandes received the Iron Cross first-class  after the performance of his division at the Battle of Krasny Bor. The Oak Leaves to his cross the fuhrer will receive directly from Adolf Hitler
Saludos Jorge