Jaws is one of my favourite films. The 16mm trailer will just be a "bad copy" for smaller cinemas. The link below is a documentary about how they remastered the film for blueray.https://www.youtube.com/watch?v=Lcn06rKJn4s
The conversion you posted is like the opposite of this. I don't know what they did but they didn't do it very well.
I have a super 8mm copy of Star Wars from the 70's, it's a 300ft version with sound (the Kenner version?). Although this is a "cheap" copy of the main scenes from the movie the image quality is rather good.
I've got a day off on Monday if you'd like to see some scans.