What is this Badge?

[TOBRUK]

I have had this for many years, and i don't know what it is.
Any help would be great.

[bichon]

Hi
Your badge would appear to be what is known as a horse Martingale Badge, which was worn on the horses tack by Mounted Infantry Officers.

here is one link
British Infantry Mounted Officers, horse breast plate

cordially
Didier