Holy fek is that what they are going for now? I bought a used 30th anniversary edition a few years ago (1861 movement) for way, way, way less than that. I'm never going to sell it for these reasons:
https://www.overclockers.co.uk/forums/posts/29297375/
But nice to know I haven't lost money on it. Hesalite for me. I've sratched the "glass" in the past and marks just polish out. I honestly love my speedmaster. I also think it looks nicer.
Obviously nothing to do with the glass back. But the chronograph on the speedy was used to time the manual Apollo 13 burn on the way back to earth.