Reins guide with a park brake!
I would love to find one like that. Here is my small collections of the ones I have found.
interesting, I was wondering because I have never found one like it, sure does look similar to a reins guide though. Looking into them there were referred to as "fly head terrets" and have tons of nick names, swingers being one of them.Not a rein guide but it did go on top of horses as decoration. Can't remember there proper name, might be called a 'swinger'.