help ID this windshield

...Or is it a back window? I haven't been able to figure out what it's from. Doesn't appear to be from a VW van, ghia or superbeetle which was my first guess. Doesn't look like it's from a late '50's early 60's GM because the tops of their windshields are flat. The height is 18.75", the inside width bottom corner to bottom corner is 50.75" and the outside width across the front is 52.75" bottom corner to bottom corner. There are no markings on the glass by the way, and I don't have a story to go off of because I found it abandoned at a storage facility.

I'd appreciate any help, even if you just try and imagine it in a car and throw out a make and/or model it looks like it might be from that would greatly help me. Thanks!

http://classiccar.com/media/kunena/attachments/1014272/IMG_0447.JPG

deffenitely looks foriegn to me maybe a mg
i guess older to.. maybe 80's

It is from a wv bettle rear windshield.