Hi Prue
I now have a little more detail about this photo -
the photo is in sepia
there is no photographers name on it
the photo measures 27mm x 46 mm and is attached to a 33mm x 59mm card which is about 1mm thick. The reverse of the card appears as a natural to very light brown colour and the front is the same, tending toward faded off-white. Edges of the card are gold. The corners of the card are rounded.
The family member who has the original photo suggests that the subject could be standing in front of a portrait in a big frame and also suggests that the "interesting belt, clasp and buttons" on that person in the background may be identifiable.
I hope this goes some way toward helping more closely date the photo
Regards,
Viv