Anyone seen this before?

Thanks. I worked the back glass loose from the gasket soon after I took this photo. Turns out I forgot how heavy it is. I'm going to have to get help lifting it out and get it into my barn away from me grinding an welding. I have the car up in air on stands and it's awkward to lift. But I saved the glass and gasket. It had sealer between the glass and gasket it kicked back a little but I got it..I cut a whole section out of donor car into the roof a bit cause I had a feeling it was going to be bad going up.. The other side of car has a little rust popping out on it but nothing near as bad as drivers side which is hideous..thanks for the input.