It is -- or at least seems to be -- a 1955 Silvertone 6887 acoustic archtop.
No bridge or strings, but the tuning machines and tailpiece are intact. Neck looks nice and straight, too.
Update, Sunday: Crypto's doing well this weekend and I needed a couple of other things, so I used a little to buy an Amazon gift card from Bitrefill (yes, that's an affiliate link -- if you spend $50, each of us gets $5 in BTC) and get the bridge and strings ordered. Now for research on the best adhesive ...
* For some reason, I get a real Django Reinhardt vibe from this instrument, even though Reinhardt favored the Selmer.