What a wonderful photo this is. From the vendor I understand that it was taken in colonial China, the date on the reverse is 1925.
Back in the day being an official in the Empire meant a healthy pay packet if you originated from the mother country. This chap's Triumph bears that out, the SD was Triumph's luxury side valve model and this particular one is looking to be quite shiny and new. It is also generously accessorised with a Cowey klaxon on the top tube, an acetylene lighting set (front light only so it appears) as well as having an electric spotlight.
|c1925 Triumph Model SD in|