If you can contact the seller, ask him to recommend an English speaking gunsmith in the area, who can examine the gun and accept the transfer on your behalf. Of course you would need to establish his bona fides, but that shouldn't be too difficult. I can't tell from his Postleitezahl (ZIP code) where he's located, but a little research on the web should reveal that.

I would recommend mine, but (1) he doesn't speak English, and (2) he's not in the same area.