It is definitely David Trevor. He's holding a copy of The Great War magazine. I have a copy of an almost identical shot taken at the same sitting, but being a photo of a photo the magazine title is indistinct. There is also a third photo from the sitting with David, son Harry and oldest grandson Sydney - three generations of Trevors. Best guess is the magazine is included to date the photo to some time between late 1914 and his death in 1916, almost as proof that he'd made it that far - maybe a photo intended for future generations? The magazine's cover features a Dreadnought in the design, and the cover design changed at a later stage of the war to a more sober one. I have been through photos of every job lot I can find that's been sold on eBay trying to identify the specific cover to put a date on the photo, and so far no luck. Many of the magazines featured senior officers on the cover so distinguishing one WW1 general from another isn't easy! I don't know if David took the photo himself or if son Harry took it, or if it was at a third party studio - both were professional photographers during their lives. David would be into his late 80s by this time and living back in Birmingham, so I'm not sure if he'd still be up to a trip to Harry's home in Ashby.I have found a photograph on a family history web site which I believe is of David Trevor although it was credited with someone else's name. He looks quite elderly. I would be intrigued to know the significance of what he is holding. Maybe MSB can throw some light on this?
Brilliant work there @mikejee - many thanks for taking time on that.I think I have found the issue of the Great War in the photograph. I tried enhancing the image in post 69 and show it below compared to the the cover. It is issue no 54 dated 28th aug 1915, and the photo is General sir Archibald Hunter, Commander of then third army.
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From the same family history web site, here is a photo of David's eldest surviving child, Phoebe Ellen Trevor via his first wife Jane Holtom (assuming the attribution is correct. She resembles David to my mind). Born 1853 reg. Evesham - died 1921 Birmingham. She married and had six children.
Considering David was a photographer and so was his son, it seems a shame that the only photographs of him seem to have been taken later on in his life. I don't know when he first added photography to his extensive CV.
Slim pickings...At some point it might be worth trying to trace any surviving descendents of the four daughters from David's third marriage. I'm currently using this family line based approach to locate some missing photos in a different local history context, and contact has been made.