Side by side, you can see that the two machines are very similar in shape, size, and appearance...
The biggest issue with Mark's machine is these two chunks of the back that are missing. These are, if you've never had the opportunity to look at one of these machines in person, the points where that piece hinges back so you can adjust your margins.
Looking at this picture, you can see the truth behind this machine: it has yet to be touched or cleaned. I have absolutely no doubt that when Mark gets around to this machine (it's pretty far back in the backlog of machines to take care of as far as I can tell) it will get a new lease on life, maybe even as a great little typer to leave out for guests to play around with.
Here she sits, in the case Mark so kindly gifted me. It's a perfect fit, given that the two machines are the exact same size and shape.
Just a fun little close up of the handle on the case showing off Underwood's attention to (some) details.