It's impossible to see. I jammed my digital camera in there and took some pictures, but it's too close to focus well. I also put some tape over the stamped plate and did a few rubbings, a bit better but not much.

The vehicle is a 1983 300TD.

Here's what I know:

3?5 200 MW 28-1

The ? may be a 2 or a 7, I'm not sure. There may also be a 1 right between the 5 and the 2. Any insight as to how many digits there should be, if any are standard, etc. would be great.