This tent fly is probably from the non-ultralight version of the Marmot Tungsten tent. It’s maybe 7 years old and weighs 2 pounds with no defects. You can see the clear window at the top of the photo. I bought it second-hand thinking I would use it fly-only, but never did. It looks new and I suspect someone bought a used tent body only and didn’t need the fly.
Give me some measurements like short and long side so I can verify it’s what you need. You can pay shipping only if you want it, or add a few bucks.