Royal Flying Corps Cowl Helmet
 
 
Standard issue RFC "Cowl" or "Hood" helmet as issued to flight crews. This pattern of helmet was favored by observers, who were more exposed to the wind. The front opening is lined with rabbit fur and the flannel lining is stamped with a faint WD (War Department) mark.
 
A close-up of the faint WD (War Department) mark on the interior.