Pictures below:

I would love that machine -- been looking for a German keyboard typewriter locally for some time.

Funny how I don't even think about "value" when it comes to typewriters -- mainly because what I have are machines that are not rare by any definition. But I also don't think of typewriters as having a market value the way things like cameras or coins do. I am sure I am mistaken! 

With non-rare antiques or collectibles, there is almost no such thing as 'value' or 'worth'; there's only 'what you can get for it'. This is 99.9% based on what condition it's in. A refurbished, repaired, reconditioned, well cleaned and perfectly working machine (whatever kind of machine) in perfect cosmetic condition is going to be 'worth' more than a clapped-out banger, even if the clapped-out banger still works perfectly. In that case, the 'worth' is in all the work you did to the machine (or in your luck in finding it) that ensures its near-new condition. Lots of people on eBay selling a typer they found in the attic seem not to understand this. Others just want to avoid landfill and sell it cheaper than they might have.

But if I've decided that a certain typewriter is 'worth'  a certain amount - that is, I think I can get that amount for it - and it doesn't sell, then what? It becomes more a question of 'what's it worth to me to get it out of the house'. And of course, some of the best and most worthwhile (a different thing) things are ;worth' very little, because they're still common.

ALSO, as has been pointed out again and again on this board, there are massive regional variations, as different typewriters just seem to be a lot more common in different places. Yet another thing that messes eBay up, as (for example) a Hermes 3000 owner might search on sale prices and factor the USA ones into a UK (eg) listing, even though they're more common over here.