|ASC Soldier from the 1870s by A F Gale, Winchester|
The subject is wearing the the 'other ranks' five-button Indian pattern scarlet frock with collar patches and half-panel cuffs in Regimental facing colour. The bottom edge of the collar, the shoulder straps, and the cuff panels are braided white, with white trefoil knots up the sleeves. He also wears an 'other ranks' Glengarry cap.
The collar badge appears to be a Queens crown above an 8 pointed star and MAY indicate that the soldier served in the Army Service Corps, although the photo evidence is unclear.