Welcome. Condition is a major driver and hosting pictures elsewhere and linking to them here might help. A serial number will confirm that it is vintage and not a confused or deliberately deceitful seller misrepresenting a Newark Street instrument. 1970 is early for this model so it will be fun to see how, or if, it varies from later examples.
I don't follow prices that closely but I wonder if the price is high? For people who want a guitar just to play, it has to compete with the Newark Street model at roughly a quarter of the asking price. Anecdotally it is hard to predict future value but in general vintage Guilds, across the board, seem to hold their value but not appreciate very much. Traditionally the competition for a new Guild is a vintage Guild so the markets are linked. While there will always be players who can find something they get from a vintage Guild that is not present in the reissued or reimagined one, the number of those players is holding steady or dwindling. So while the supply is fixed or shrinking, so is the demand. If you need to get the asking price today in 3 to 5 years then I am certain the price is on the high side.