There's no reason to think this is a 69. There were almost no 69 slotheads.
I don't know what you mean about the pickup placement and trim ring, on my 71 (EB-0L) there's a trim ring on the mudbucker and it's right against the end of the neck, just like this one, just like all slotheads. No Gibson inscription on the cover either.
This may or may not have a non-original switch but this isn't a rebuild of two basses from diferent years.