I have a Haenel 303S, nice gun, well built, very accurate. I think this model was a 10m target rifle. It had a peep sight fitted which I still have. Power is low as I say it was built for 10m. Don't know whether the photo link will work as its the first time I've tried to link.
http://www.flickr.com/photos/40629679@N08/3732463081/