It would be helpful to see the mark. For instance I don't know what you mean by a rectangular impressed mark. Is it a plain rectangle -- solid or edges only? Name or just a rectangle? The pattern number for Booths 'Real Old Willow' is 9072, and that number can be painted in gold or another color over the glaze. I don't know why there would be a number 4 following 9072. The webmaster would be happy to help you post an image of the mark so that we can see what you are describing.
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