Originally Posted By: 400 Nitro Express

One thought I had was that this piece might have been retailed by a hardware store ("ironmonger" in the UK), a practice as common there in those days as it was here, and that the mark is theirs. In that case, "BIW&Co" might suggest - "B-something Iron Works & Co". I dunno. Beyond that, I'm drawing a blank. Sorry I can't be of more help.

That's why I said post a picture.