While these are not top-of-the-line Guilds, they are somewhat unusual (limited production I believe) and are well-regarded guitars — when they’re in good shape.
Yours however is in poor shape. It has a shifted neckblock — you can see the neck has pulled forward into the body of the guitar, causing cracks from the end of the neck into the soundhole, which has distorted the top. (Note the soundhole rosette for instance.)
Not only is the guitar’s structural integrity compromised, but this will also affect the intonation — meaning the guitar won’t play in tune.
This is an expensive problem to have repaired, complicated as it is by the necessity to remove the neck so that the neck block can be repositioned and reglued, and the cracks on either side of the fretboard extension repaired.
If you’re not going to invest in having it fixed yourself and are thinking of listing it as-is on eBay, Reverb or your local Craigslist, I would describe it as a “project guitar / needs work.”
Not sure what sort of dollar figure you should put on it. Maybe start at a few hundred bucks or best offer?
Sorry for the bad news.