I would buy it and keep it as long as it doesn't have any swastika's on it. Some folks collect that kind of stuff but I don't and it hurts the value because it's a limited market. Search some of the gun auction sites. You may find something that gives you a idea of the value.Bryan
The Haenel model 33 is a very collectible gun, and appeals not only to airgunners, but to military arms collectors. But it may not be realistic to think you're going to make a big profit off a rusty example that the seller will only send two pictures of?You also know the clip is not original (sounds like it came from a postwar Anschutz 275, which fits fine, but is not OEM), and it's missing its cleaning rod.You didn't mention the asking price, and you can google about to see what others are asking for this model. If it were me, unless the price is really low (like in the 2-figure range), or the seller will give you more info, I'd pass.