Can anyone help me Identify this mounted soldiers country? Aussie-Brit?

[popeye]

I have been remodeling my upstairs so I have been going through many of my tubs of stuff. Found this picture postcard. It was mailed to the US in 1888.
At first I was thinking Aussie but now I am thinking it could be British in South Africa? What do you guys think? He signed it at the bottom in ink.

[tailor marc]

Slouch hat... Aussie

[wizardman]

Not only Australian the slouch hat....rifle looks like a Lee-Metford..photo doesnt look Australian to me

[wizardman]

Being the Lee-Metford,predecessor to the Lee Enfields tie its age in to 1888 when the rifle was introduced (1888 – 1926), now i think the Australian mounted troops in 1888 were still using the Martini Henry..ill do a bit more for you when i get home from work..can you tell me his name

[canti44]

Imperial Yeomanry?

[Jerry B]

Slouch hat... Aussie

The British used slouch hats for years, so it does not make him Aussie. Hard to tell what he is from the picture supplied.

[Gary J]

Natal Mounted Rifles ?

Anglo Boer War website - Border Mounted Rifles

[canti44]

His signature had me flumoxed for a bit there but now I read it as Daniel B. Stewart if that helps.

[Jerry B]

Imperial Yeomanry?

Looks very similar or the same, with the braid on the cuff and the stripe on the trousers.

[KradSpam]

The pic looks to have been taken in Egypt if that helps, perhaps with the short time bracket of the Lee Metford's issue.