Mike, I thought the same thing which is why I asked about the vent window - as if the car had been left out in the weather on a road camber tilted to the right with the vent window leaking. It doesn't look anything like as bad rear of about the middle of the driver's door.
I said this morning I would expand on what I said when I had more time. The seam I am referring to is the seam between the two plates that make up the front end plate of the rocker (sill for the antipodians and poms). It is completely missing on that left side.
Here are the 2 plates.
I'm holding them together in the next 3 pictures. On the car they are welded together and to the open front ends of the inner and outer sills.
So when they are on the car they look like this.
Here is the right side of another car with road grime, but again you can see that seam like you can on the right side of Eugene's car. You can also see the notch in the bottom edge of the mudflap (rear wheel housing)plate both on my car and on the flap on the left on Eugene's car which fits around the seam when it is there.
You can see the jack hole in a couple of my views and in this view to illustrate what Paul is referring to.
So there are clearly some problems in the front of that left sill which have been partly repaired in the past by replacing the front plates and putting in a malted milk container. I'm not sure how far you want to take this, but if you want to fix it properly and keep the car, you need help from a sensible panel beater who is competent in drilling and replacing spot welds. I would recomment that you have him remove the outer sill panel at the front on the left so you can see inside, like this.
That gives you access to the jacking point, the bottom of the A pillar, the malted milk container and the rusted away piece of inner sill and any other gremlins. Then you can put it all back together again, knowing that it is all done properly. To do it properly, you really need to take the left front fender off, or at least release it away from the front of the sill. The repair ends up looking something like this.
You don't have to go this far[;)]
You can buy those two end plates from Tom Hanson as well as an outer sill if necessary. Don't buy the W109 outer sill, it is about $600 plus, buy a W108 sill for less than half the price, you only need the front part. The rusted inner sill can be folded from sheet metal as Paul from the UK showed. It really depends what you want to do with the car as to how far you go.
I hope this is helpful, and if you want advice on how to remove the front fender without having to repaint it, ask. Obviously, that sill garnish mould will need to come off as well. Be careful doing that, they are NLA new.[:I]
Art