The 3 designs of Remounts badges are a bit of a mystery as the Remounts were part of the Army Service Corps and none of the 3 designs were officially sealed. As far as I can find there is no official mention of these badges. If any one has any photos of any of them being worn then I would be interested to see them.
This man was Remounts and is clearly wearing the ASC cap badge.
https://wolverhamptonswar.files.word...r-cis-1916.jpg
As is this chap:
https://awayfromthewesternfront.org/...-the-remounts/