Four Firefighter Helmets German 20th century steel, dyed black. Factory fire brigade of the Heinrich Otto & Sons cotton spinning mill. One troop leader helmet with white stripe and factory monogram OSH (?) and three other helmets with the same monogram. All with comb, leather neck peak, leather straps and leather interior with lacing. Inside size designation, 1 x 57, 2 x 56 and 1 x 54. Once inside owner s note. Manufacturer s mark DRP THALE on the inside of the neck shield.Size approx. 28 x 22 cm, height approx. 19 cm. Partly rubbed, partly bumped. Please inspect for yourself.