Hello everyone -- I finally got a photo of the mark on my dish to post here. Hopefully it will help us figure it out a bit more, but I doubt it! What a puzzle! I've searched through tons of books on antiques and also maker's marks, even looking for anything close that could have changed slightly when the company sold, etc., or any company names starting with F, S, or B, and even Y in case that's actually part of the mark and not just a divider between the letters, and I'm sure it's no surprise to all of you, but no luck yet. I have an idea I'm working on but it's probably not on the right track either. This is a challenge now!!! Keep searching!