Highland Light Infantry on a Slider

[Brwbroon]

Hi all,
I have this unusual badge in the collection, a Highland Light Infantry badge of the upturned scroll pattern but fitted with a clipped slider. I have another of this type but with the usual lugs. The question is, if it is genuine and I think it is, what was it for?
On Ebay a while ago there was a photo of a soldier in what looked like Hospital Blues wearing an SD cap with an HLI badge. Could the badge have been made for this purpose or does the pattern even date to this period.
Your thoughts please.

Eric