...I dont have much of an idea about old photographic techniques so could be a very simple/easy answer to this.
This is an old family photo, or at least we always presumed, on the back it says "taken at Marsha(presume it says ll after this) in croydon"
Thought it was B&W print but the image seems to be on glass and relies on being placed on a dark background.
So my first thought is glass negative, I just always presumed would have been printed onto paper.....
Sorry for pic, via my phone and im at my moms.....
[Sorry, image deleted during forum software upgrade. Please re-upload if so inclined.]