Judging from the photos (and I know an in-person inspection is the only way to know for sure), this set appears to be in extremely nice cosmetic condition.
Not $600 worth of nice, mind you, but nice all the same.
Worth $200 max and from the 70's at oldest. Nonetheless solid machines, which are very dependable and quiet running. The downside is that they are somewhat lacking in performance when compared to their WP/KM counterparts. It should be noted that this Newton Drive mechanism was the most reliable according to CR until the Whirlpool direct drive mechanism proved much superior.