The RAF B-Type Leather Flying Helmet was a classic piece of aviation equipment used by the Royal Air Force during the Battle of Britain and the early years of World War II. Designed by FiveStar Leather, it was introduced in 1936 and remained in production until 1941, when it was replaced by the C-type helmet. 

Key features and details:

• Construction: Made of high-quality leather, providing durability and protection against the elements.
• Design: The B-type helmet featured a distinctive shape with a rounded crown and wide ear flaps. It was designed to fit snugly on the pilot's head and provide adequate protection from wind, rain, and cold temperatures.
• Oxygen Mask Attachment: Two brass press studs were located on the sides of the helmet, allowing for quick and easy attachment of the D-type oxygen mask. This was crucial for high-altitude flying, where pilots needed supplemental oxygen to breathe.
• Color: Typically, the B-type helmet was painted in a dark brown or olive green color, which helped to camouflage the pilot against the background of the sky and ground.
• Usage: The B-type helmet was worn by both fighter and bomber pilots, including those flying the iconic Spitfire and Hurricane aircraft. It was a common sight during the Battle of Britain, when British pilots fought off German air raids.

The RAF B-type leather flying helmet is a symbol of the courage and determination of the British pilots who fought in World War II. It is a classic piece of aviation history that continues to be admired and collected by enthusiasts and historians.