Screen corner
I'm sorry to say that I can't identify your corner based on the provided photos. This service requires a clear picture of the corner out of the frame and in as close to undamaged condition as you can manage. I also need you to tell me the thickness of the frame.
I'm afraid these photos don't tell us any information we didn't know already. We're still dealing with the same limitations. If we can't see the corner out, we can't help.
At this stage you would be better served contacting the maker of the window and see if they have a record of exactly what was used. In the meantime, you can see our full selection of corner keys here.