I always like my records as pristine as possible, However;
DJ Graffitti as I call It, I know what you mean, (Authentic, of It's time & Part of the records History)
If the Record Label was Autographed at the Time of release, all well & good.
Even though It could be argued that Yesterday is part of a records History,
the sleeve is the better place for Autographs I reckon,
Doesn't seem right somehow to Deliberately write on the Label, whatever the reason.
Similar goes for Stickers, some are to be expected, and of the Period.
I would never dream of attempting to remove them.