United Kingdom
Royal Horse Artillery

Carte-de-Visite, Studio Ritter Molkenteller & Co. in Bombay & Poona.

Field Officer, Royal Horse Artillery

This photo shows a Field Officer, as shown by the elaborate braiding on his cuffs.
His exact rank is hidden by his capillar excentricities - but part of a Crown can be made out, which means that he's either a Lieutenant-Colonel (Crown) or a Colonel (Crown and Star).
He is wearing the Campaign Medal for the Indian Mutiny.