I've looked into the firearms used during WWII, but I can't find what pistol was used by Yugoslavian infantry men at the time. What did they use?
I presume it would have been the F.N. model. 1922:
This was a variation of the F.N. model. 1910 that was commissioned by the Yugoslavian military in the inter-war period with 60,000 ordered with both general issue and "officer" markings.
Note, the Wikipedia article is horribly referenced, but you should be able to confirm this in Anthony Vanderlinden's book FN Browning Pistols: Side-Arms That Shaped World History as several other sites refer to it (I don't have a copy so can't verify this).