Thanks everyone who participated, but we're a long way from the reserve on this one.
I'll keep in mind for any future listings to include undercarriage photos.

I have a few pictures I took when I was waiting for the car to go into the workshop for the repairs we did in April. You can see some of the frame rails there.
Most cars that have rust issues will have them all over. These cars are known to develop rust around the C pillars (rear window) for example, and this car has none anywhere. Most of its life was spent in Nevada and California, so little to no rain or snow.
I sent the pictures to MB Market.
Furthermore, some of the pictures from the photoshoot are at a low angle, where you can see the rocker panels and some of the frame rails as well. 

I tried making a video showing the undercarriage, but it's too close to see anything.
Unfortunately, without access to a lift, I cannot take any pictures or video that would show what it looks like.

I shot a video showing the sunroof operation:

https://youtu.be/2VD9lmsa4jY

@DLC32 Not sure I hear anything abnormal? I'm shifting the gear manually, is it the clicking of the gear lever?
What's not 100%? It's a 46-47 year old car, so likely a few things. Every now and then I've sold a car to a first time collector, and I think it's fair to set expectations. All cars suffer greatly from sitting for more than even a month. But on this car, everything works as far as I know, and after the car came out of the shop in April, there were no leaks requiring attention. The last time I drove it, it started right up and drove without issue. I would feel confident packing up my bags in it and driving it to Florida from California. But it's not 100%, no. But probably 95% perfect. 
I bought two cars this year out of collections, one from a well known collection last summer, and one from a small collection in Florida, Visually perfect, but mechanically a mess. Both took months in the shop getting them roadworthy again. The Mercedes offered here is easily collection quality visually, and mechanically better than most Mercedes of that era on the road today. 
Does that clarify things?  

@rbassous I don't have access to a lift, unfortunately 

We're down to the last 24h! If you have any questions, now's the time! 

ALSO:

If you have not bid before, please take action now to register your account for bidding, add the Credit Card and make sure it works. If you click bid at the last minute, and you need to add your CC details, you'll likely miss out! 
We're far from the reserve, so feel free to make some test bids to make sure your account works! 

@tmt721 Under $30K WOULD be a bargain, wouldn't it? 

@EricF No rust anywhere. It's INSANELY clean. Even on the chassis, there's nothing to speak of.

@tmt721 Wheels are just bolt-on modifications, so that's no biggie. But someone applying an AMG kit for example would be a bit of a shame, but to each their own :-) 

@manyMB I never tested it really, I'll try it out as soon as the weather lets up.

@Easyway I actually looked into getting a set, but seeing how original the car currently is, decided to keep it stock.

@tmt721 Thanks! And yes, we're more than happy to assist with shipping this car anywhere! 

@DLC32 Yes, AC was repaired earlier this year, and sunroof works perfectly (I guess I forgot to open / close that during the video... I never use sunroofs)

@Allmercs Thanks! And yes, this clean is extremely rare. 

Welcome to the auction of our W116 450SEL !

I made a quick video to showcase how it drives. You can see me let go of the steering wheel, indicating it tracks straight. You can also see me do the same right near the end of the video, while braking. The new brake discs and pads doing their job, everything nice and even. You can also see a kickdown, the windows, etc. 

Everything works on the car. It is not 100% perfect, but close to it, and I think it's safe to say it's by far the best one on the market today, and it will be difficult to find one as good as this any time soon..
Happy to answer questions!