Almost impossible from those pictures. To small and too far away.

+1... In general terms, it looks like a white window with brown grids. That could be sourced from almost any manufacturer in any material.

That was my first thought also but when i reached out to the local window companys there grids, gbg and sdl do not go along the outside border of the window according to them.

good call on that... Could be a brown window then set in white Casing and Je's. That or a custom paint job.

I have also done overlays on glass as in the pic below. This is a "leaded look", however no reason that brown couldn't be done, or even a copper or something similarly dark.

What are the chances that is a steel true divided window with the frame painted white?