Re: Odd early 70's custom
I disagree, the photos you posted to my eyes more than back up the fact that that was indeed not done at the factory, as evidenced mostly by the extreme "shelf" left on the body side of the neck joint. Indeed, the pics above clearly illustrate the former existence of the rear binding and just how much sanding had to be done to eliminate the binding channel.
This shows up most clearly in your second pic. In addition, the rounding effect overall is just far too uneven to even assume this is a factory job, ESPECIALLY in the neck heal area.
What makes you think this a factory work other than your personal opinion? IMHO, there is no way the rounding is a factory job. The burden of proof is on you to demonstrate otherwise. Those more expert than I can confirm or deny what I'm saying.
Bottom line, it's a cool guitar, why do you need it to be a "Factory Special Order?"