Dean - They are becoming rare and are a collector's car these days. I do see them occasionally driven around in various conditions, and there are some magnificent restored Karmanns owned by collectors that are only ever seen at shows. This particular car has a Serial number that is part of the USA run in 1961, but is is not a conversion. That in itself has "raised the eyebrows" of the collectors. It is quite unique.
Dad still has the original invoice. BTW - he did most of the work - not me ! But I've been an enthusiastic assistant. I am inspecting the rebuilt motor tomorrow and I might add some pictures. I'm no car enthusiast, but working on these cars has taught me to appreciate the effort that REAL car enthusiasts (like the guys on this thread) go to for their cars.