I would like to clear up one thing.  There is no such thing as a "Karmann Edition" VW Bug Cabriolet.   Bug cabriolets (convertibles) had bodies made by Karmann coach works. The same coach builder that made bodies for the Karmann Ghia.  This means that EVERY Bug Cabriolet from 1949 to 1979 has a body by Karmann.  They all have a Karmann tag on the side of the car and there is nothing special about it.  VW simply farmed out the building of the bodies to Karmann rather than do it themselves.  If you see a listing claiming the car is a "Karmann Edition", the lister is probably just misinformed, but could possibly be trying to mislead you into thinking there is something special about the car when in reality, it's the same as every other '49-'79 Bug convertible.  Many people also list them as "Classic Karmann" which they may be, but it still implies that the car is somehow a rare find.  Prior to 1949 there was a two-seater Bug cabrio made by Hebmueller.  They were only made for a few years before the factory burned down.  They are far more rare and valuable.  Cabrios with a back seat always had bodies by Karmann.