The police Custodians helmets were first worn 1863 replacing the Top Hat worn before
Originally made of cork and balanced on the head they provided none or limited protection. It wasn't until the 1970's that a proper padding, safety style harness, chin straps and hard shells were gradually added.
This helmet is the crest style of custodians helmet, purchased without its badge on the front. Helmets with badges are sold for much more money as the badges are collectable.
One other note the custodian helmet is the helmet worn by male police officers
The photo below is from a reenactment of the Battle of Orgreave, a violent confrontation between picketer and police during the miner's strike.
