Subject: Capt. M. Dought(y)?, 10th Regt.
Photographer: William Pryor Floyd, Wellington & Wyndham Streets
Format: carte de visite
Photo courtesy of The Pottinger Hong Kong hotel.
There's a pencil note on the back of the card: "CAPT M DOUGHT(Y)? 10th Regt. 1872".
The Captain's name is not clear, but the year fits the range of years, 1867-74, that photographer W P Floyd was active in Hong Kong.
The Jan 4 1875 edition of the London and China Telegraph also confirms that the 10th Regiment were in Hong Kong during 1872:
THE HEALTH OF THE ARMY IN CHINA.
The annual report on the Health of the Army in China has just been published. During the greater part of 1872 (the year to which the report relates) the first battalion of the 10th Regiment was serving at Hong Kong; and on leaving for Singapore (where it is at the present time stationed) it was relieved by the 80th regiment, which has since remained in China. A battery of the Royal Artillery, detachments of the Royal Engineers, and the Army Hospital Corps, and the Garrison Staff, made up an average strength of 769.
The full name of the regiment in 1872 was 10th Regiment of Foot, then in 1881 it became The Lincolnshire Regiment . Via several re-organisations, the modern-day descendant is the Royal Anglian Regiment. (source: Wikipedia).