Campbell was a silent partner with the Isaacs. He was an attorney in London. The Isaacs sold a large number of those rejected accoutrement sets to other customers like the Volunteer units and of course the CS government/Southern states. You would think an actual maker's mark would be spelled correctly, but you see this with modern reproductions all the time. The fake maker's mark. The most egregious example is the elongated US style 72" sling for the reproduction P53s which is a complete fantasy piece. I remember pointing this out to a well known Civil War sutler and he responded "...but that's one of my best sellers."