The Haenal 28 is my all time favourite pistol followed by the Walther LP53, I have both as pride of place in my collection alongside a BSF S20 Match and shoot all on a regular basis , To me the joy of collecting guns is to be able to use them for their intended purpose, I deliberately look for .177 examples where possible to allow me to use them in our club classic comps, The example you have of the 28 there is superb