I had this same year Studio... same finish too. One of the best Studios I have ever owned. Had some serious major mojo. Those came with 57 Classics that year and they sounded superb in that guitar with the modern weight relief. Mine was much lighter (under 8 pounds), so maybe that was a factor too. Regardless, you scored a legit Gibson at a fair price. Not a steal, but fair nonetheless. Congrats.
“Overly cautious” = buys guitar before asking. Gee, I hate to see what kind of risks you take when you’re being careless
You bought a guitar from CME. A store not really known for being super shady selling fake Gibson’s. I think you’ll be ok, it’s real.