It's definitely all original. My dad was always one to keep everything as is to a fault. He wouldn't even remove the plate behind the pots on any guitar for fear of it losing value, lol!!1960 Gibson Les Paul Junior Double Cutaway - at first glance it appears to be all original.
Welcome here and sorry for your loss.
That's an absolutely beautiful 1960 Double-Cut Les Paul Junior!
I hope you are in a position to keep, cherish, and enjoy your father's guitars.
True words. Wish my dad had played the guitar instead of piano..Juniors from the golden era are considered by many (myself included) to be some of the best guitars on the planet. What a nice memory to have of your father!