Can anyone read this?

[James18]

Trying to transcribe the signature in the bottom-right. Looks like THIV----, YORK

Not exactly sure, but would love to know.

https://i.imgur.com/eQ8PHwl.jpg
https://i.imgur.com/BKxq0ea.jpg
https://i.imgur.com/MIYj8DY.jpg

Any help is much appreciated. Thanks.

[kiterunner]

Thwaites York. I don't think it is actually a signature but is the name of the photographer embossed or stamped on the photo. I found, by Googling, reference to a photographer "the York photographer George Thwaites who was based on Petergate" in 1905. There are lots of his photos on this site:
http://www.thecardindex.com/search?class_name=&id=&search=thwaites

If you click some of the individual photos to view them, you will see the same photographer's name stamp / embossing as you have.

[James18]

Oh wow, that's almost certainly it, then. He even has a similar horseback photo here:

http://www.thecardindex.com/postcards/york-unknown-thwaites/4073

Thank you so much, kiterunner. Awesome stuff.

[James18]

@kiterunner

Judging by Thwaites' portrait-style photographs such as this: http://www.thecardindex.com/postcards/york-royal-artillery-thwaites/3729

...do you think this could be one, also?

https://i.imgur.com/znAp20F.jpg

It's the same man as on the horse in my first post here. No idea when these were taken, but I think maybe ~1919.

[kiterunner]

Could well be.