markus, The model four and Seven are often forgotten, but are exellent speakers - they cost a good chuck of money back in 1960, about $200 each for the Seven and about $230 for the Four. All these early KLH's reflect high build quality and strong performnce.
I forgot to mention a story of the ultimate Kloss items that slipped away. About five years I sold a model 21 radio to a guy who turned out to be a Boston Globe reporter - he had interviewed Kloss for an article circa 2000. About a year after Kloss had passsed away in 2002 he had made contact with family members and was told that the contents of his basement had been cleaned out, meters, tools, electrical parts, etc. by a attic/basement cleanout company so the house could be sold.....Oh please say it' not true ! ! I can only imagine how interesting these items could have been, audio odds and ends owned by the man himself. I only hope that nothing of historical importance was dumped in the trash like notebooks. I think there would have been some very interesting things....Kloss was a hands on guy who liked woodworking, sketching and so on.
I myself live about 35 miles from Boston and have found my share of neat kloss items through the years and met a few former KLH employees and had some informative conversations.