Ever bought a plane that has one side thinner than the other? I have and always wondered why it was like that. Of course early produced cast iron planes were made one at a time and just cast that way, but usually both walls were thin. The most obvious and most likely other explanation is that over the past 100 years some owner ground down one side to eliminate a blemish or some ugly imperfection, somebody's initials or name or something else that didn't please them. We a