This is English Leather work made by Gibsons saddlery in Suffolk for a customers race horses for the sales. It has been kept so well, leather is very soft. 
Its havana in colour, selling as a whole package and was £150 new. So with the bridle which I would say is a cob size you also get a leather coupler and an extra long thick lead. Also with a bit.
We have got pictures of the bridle brand new if you would like to see but not high res enough to put on ebay 
Any questions please ask