660,000 km isn't low mileage, (372,822 miles) it's not a complete car, and it shows signs of many hidden problems. Even if it were a low mileage car it still looks like it has nearly half a million miles in it. Notice the rear floor carpets are darker.....that's probably because they're wet or used to get wet often. That coupled with what PTASHEK has already stated, and you have a car worth it's weight in scrap or a little more.
I realize that W116 cars in the U.S. are very inexpensive to buy compared to other markets, and often times people will give them away because they're such a hard model to sell. However, i think value based on condition is a worldwide understanding among enthusiasts regardless of current regional values. In this particular case, the pictures themselves tell the whole story.