Hello, do you have an opinion on the mark next to the bigger shield mark? Is it a pictorial mark or a letter mark? AD&Co, or DA&Co looks like the concern, but no British suggestions come imediatly to mind.
After checking some Sheffield trade directories and a Grace's Guide reference, "Austin & Dodson", do not look to me as a good fit as makers of your hollow ware. They have a classification as "Steel Refiners" along with the manufacture of "heavier" items like tools, steels and files. The question I asked about the unclear mark in your image is answered on that other site though, as being a letter "E".