Hoping to get the picture attached this try. The size is 7 1/4 in wide and 10 5/8 inches long. One of the metal ovals looks like chrome and the other metal oval is painted black. The glass is fastened with black screws on the back side. Can anyone identify which old auto this came from?
We had a 1912 Buick Model 28 Roadster with such a window but Buicks came without tops in 1912 so it could be an accessory used on many different cars that came without tops.
Those may have been available as an accessory that could fit any car. I have two here that go to a Mercury Speedster. I suspect the "chrome" is actually nickel. If it is chrome, it's post Model T era.
Like Ken posted, oval frame bevel glass rear curtain lights were popular in the early to mid and late twenties.
Went out of fashion but then returned in the seventies, anyone remember the 'opera windows' on vans and vinyl padded roof cars then ?
From 1923 Auto supply catalog