It's sitting next to an electric, laptop slide guitar. I imagine that this is an acoustic equivalent. The front reminds me of fronts carved by Orville Gibson. I don't know if laptop slide guitars existed in Orville Gibson's day but if they did it might be worth examining other construction details to see how well they match.
It’s pretty clearly a slide guitar. What the shop owners and staff don’t know is what’s the origin. Given the popularity of Hawaiian slide in the 20’s and 30’s, it is likely from that era. When did Orville pass away? Do we know if he still dabbled in instruments after he sold to Gibson?