6 line Star Corner
I believe this to be a corner piece for a set of borders. I found it in Chicago at Architectural Artifacts. It was among a huge vat of pied wood type. I searched for about 3 hours (I would have looked longer, but I didn’t want to continue inconveniencing the friend I was there with) and though I found and rescued some different (not stars) border pieces and some other sorts, I didn’t find any other corner pieces like this.