British Bobby Police Helmet Rose Top and Hertfordshire Constabulary Plate Brown Bess Comes complete with 3-10 inches

Comes complete with 3-10 inches of attaching wire

Original Item: First introduced into the British Fire Service in the Victorian era of the 1800s these "Merryweather" pattern helmets were used to fight fires right up until WW2

although “polygroove” sounds like a modern term

Answer: Look at the air-vent lugs

for several years

British Bobby Police Helmet Rose Top and Hertfordshire Constabulary Plate Brown Bess Comes complete with 3-10 inchesOriginal Item: Mostly manufactured by Hobson and Sons these were made surplus by the Hertfordshire constabulary as a different model Bobby Helmet was adopted. These helmets, in near excellent condition, come complete with chin strap and have a helmet plate (badge) with the E. R. II cypher to center and Hertfordshire Constabulary in surrounding ribbon amid star burst and Royal Crown to top. The Rose Top model is the earliest of current models in use