skyjedi2005 said:
...are these foreign prints with the english audio re-recorded from laserdisc or DVD.

The seller told me that the original owner who sold him this print was from the U.S.of A. The sound is optical so unlike super-8 mag stripes, it can't be dubbed over. The print is in English, btw..

The only real print i know of that is authentic is the derann films super8mm release as they had the rights to produce them for a limited time from Lucasfilm.

I didn't know Derann offered ESB but ANH was exclusive through them for awhile. Only one of those super-8 ANH prints has been sold on eBay in the past two years that I know of..

Classic Home Cinema in the UK used to offer a super-8 'scope print of ESB sourced from the German version that they re-dubbed into English but the opening scroll was still in German. I tried to obtain a copy of this print, which I was informed was still available last year on a special-order basis but apparently they've stopped production altogether.

..there is no guarantee if the stock is Eastman pre-lpp

There are ways of identifying film stock. Here's a webpage that offers a useful guide: http://www.paulivester.com/films/filmstock/guide.htm