Driving
The National Horse Brass Society, UK. Leather martingales by Cox the Saddler.
[It Beats A Membership Sticker, NHBS 2018]
[National Horse Brass Society 2016]
[NHBS]
I don’t know of a parallel US association. Am I missing something?
Thank you for reading,
Katherine Walcott
Virtual Brush Box 
Pretty.
Nice. At one time, the size, shape, and lettering – if any – on the brass indicated which guild or city the horse owner belonged to.
Forgot – multiple brasses sometimes indicated winners of a competition.
Little metal pieces of history.