The lack of octave key brings its value way down...it's not like a generic octave key would work on that neck, so one would either have to find a machinist or shop to make a replica, or at least something which works with the key saddle....or remove the saddle and replace it with a conventional one...
also no thumb screw....not a huge deal but again, a replacement would need to be made or found...
also no thumb screw....not a huge deal but again, a replacement would need to be made or found...