My brother recently picked up a 68 Chevelle project and this shifter was in the trunk with a bunch of other parts. I know it's not from a Chevelle / Beaumont but looks GM to me. It says Spicer on the side. Here's a couple pictures. We'd like to sell it once we know what it's from.
Oh and there also was a 69 Beaumont grill there too. It's missing one insert but other than that very decent. I'll post that later too.