I mean no offense especially if you know this, the import marks are the name of the company that brought the weapon into the US for sale, as in Action Arms, or CZ-USA, if there is nothing like that on your weapon then you can (or should be able to) tack on another 100.00 US, especially if that Akah info was/is correct, marking that pistol as a German Model.
Like I said double check and I wish I could buy that because I would without a seconds thought. It is certainly out of the "Common" designation and into at least the "novelty/collector" stage.
If you haven't allready tried, I would suggest trying to sell it on GunBroker.com or AuctionArms. Both are very well known and they have hundreds of folks every day searching their sites. Best of luck.