Dear Friends,
I'm Nakorn W. from Thailand. I'm glad to hear you talk about Siam Adrian Helmet. So I would like to give you more information. The helmet you're discuss is Thai army officer's helmet during WWII. The logo symbol we called "U-Na-Lom" (อุณาโลม) and the word in symbol means "Sacrifice life for country". If you need more info. about Thai, I'm glad to help you. ^ ^