those grips look to good to be original, it may be my eyes or the photos but they look really great.
Enjoy it as is. Maybe an internal "tweak" here or there, and keep it to hand down to the family.
Really tough call, I can equate it to an 1824 Rosewood Candlestand, I bought at auction, it was black from decades of old finish, varnish, wax, polish, you name it. Not pretty, and a shell of its former beauty.
Some said: get it refinished, strip that old crap off and bring it back to its original luster, while some said the opposite, it will ruin its original nature, and historical significance of the piece.
You know what? I refinished it myself. Took me 6 weeks to methodically bring it back to life. I'm glad I did, under that tar nasty crap was the original wood. As beautiful than as it is now. I was offered an amazing amount of money for it now, and just said NO.
It sits by my 1919 Oak Victrola, (which is mint), and I'll never part with either.
Like I said before, "Your Call". Enjoy it none the less, its a piece of history.