Check Holger's website, he did a comparative review of the Zeiss 8x50 some years ago:
http://www.holgermerlitz.de/zeiss8x50.html
I've got the 8x50B which I use quite a bit in the field. The optics are good to very good, although modern binoculars with modern coatings have better transmission and better contrast. Excellent resolution in the centre, fading gradually towards the edge. The mechanical quality of these old Zeiss West porros is, however, second to none. They're just beautiful, even better than the Swarovski Habicht.
The field of view is 130m/1000m. The 8x50B is basically the same as the binocular in the pictures, just with rubber eyecups. These eyecups are probably still available from Zeiss, so you can change the hard eyecups. Eye relief is 16mm, just about enough if you wear glasses.
Even if this pair is mint it is something like 50 to 60 years old and can probably do with a thorough cleaning and so on. Quite a few of these old porros have a distinct haze on the lenses and prisms and really neeed to be dismantled and cleaned. This is *not* an easy job with the Zeiss due to the airspaced objective lenses. This has to be borne in mind. I had my pair serviced in Wetzlar, so it's as good as new.
The price ... Well, I think the 8x50B is more of a collector's item (that can still be used and enjoyed in the field). I personally believe US $ 800 is too much unless the bins were serviced recently in Wetzlar. Even if they're clean I don't think I'd pay much more than about $500 to 600 for it, less if it's not clean.
If you've got any more questions feel free to ask.
Hermann