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Ludwig Baer book, Vom Stahlhelm zum Gefechtshelm I, page 390.

Two small black and white pictures and one sentence.

Jugoslawien
"Serbian Kingdom used Austrian and German helmets, and aplied...

What are picture text translated in Engrish? Where did that pictured army operated?

Baltics were under german occupation area, and likely were influenced by them as well. Don't know about...