I've done it on a couple of my users, I'm borderline OCD or more? If a good amount is there I've used a dremmel tool with a cut off wheel to remove 95%, then a couple of small files to finish. With the old type molding some skillets come out better than others. It's still true today that time in a piece is money. For me if you take your time and after seasoning I can't tell. I do mine after lye treatment and before any type rust removal.
I can't tell you if it affects it as a collectable or not. that's for someone with better knowledge in that area to say.
Someone may have what they think is a all perfect skillet and in fact maybe somebody trued it up 50 years ago??