The British helmet used by soldiers during the First World War, also referred to as World War I or The Great War, was a steel helmet which was called the Brodie Helmet. Soldiers wore these to protect their heads as contact between their heads and another object like bullets or melee weapons could prove to be dangerous and life-threatening.
Their Model 1916 was their first all steel helmet which replaced their leather spiked helmet.
18-22 i think
They wore both the British (Boer War era) khaki pith helmet and the British Brodie steel helmet.
A helmet is a symbol of war as Ares was a god of war.
Both helmet and gas-mask .
$100 try ebay
65 I think. After that you could join the Home Guard.